Malicious PDF — malware analysis report

Static analysis result for SHA-256 88ca9f0d96b30cad…

MALICIOUS

PDF

92.9 KB Created: 2021-07-21 16:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: fdbe3516085bf88b9257ca083228bf30 SHA-1: 81da9c31b36361271765c122c744449ab94b4902 SHA-256: 88ca9f0d96b30cadc3ca037b3c6dc3ce6acb464073543be7f54e63cb481c611f
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the use of an image lure to redirect users to an external URL, consistent with phishing tactics. Although no scripts were extracted, the PDF structure and heuristic firings strongly suggest a phishing attempt designed to lure users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://feedproxy.google.com/~r/sq/ugae/~3/kVSxLQpkboc/square?utm_term=can+a+banana+be+too+ripe PDF link annotation
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e80c601873c46ac93b928e/1625820256617/peace_be_with_you_always.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec8118700aa07a7894b840/1626112280730/iodometric_titration_of_copper_sulphate_with_sodium_thiosulphate.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f1666e6186c4310045bbe3/1626433134569/how_to_make_grey_in_paint.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f299f31d3507074216f7de/1626511859599/dasotexubowalikafa.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f66c353ca5073dfd64798a/1626762293526/tet_exam_question_papers.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ee29db8685745b7d1388ef/1626221019552/kasuzo.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec841a3a853d606aec9d78/1626113050418/rubric_for_science_project_model.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60edb5dd881afe0f0cee44b3/1626191325471/kilujuxisevakazewusowef.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f75a147009fb6d9ff5b503/1626823188937/about_rain_today.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec818a3a853d606aec4ee2/1626112394964/staffing_class_12_notes.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e904bcb68d8f0f4bf6fa47/1625883836783/order_by_sql_alphabetical.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60edbce1695afd0f1e9856fa/1626193121620/mivizitibutidowaxo.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f635cc2919ae181dc72d75/1626748364116/quiz_of_the_day_with_answers.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f5d63467dd60059316219a/1626723892810/37459254688.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f169de2c92ee1ddde07ec4/1626434014446/tessellation_in_the_real_world.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f5d9960e0b8d05115bc886/1626724759032/cylindricity_in_gdt.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f814fc8c94980aa172be18/1626871036887/waliretobiraxuruledojor.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e79c4ffdc75e32ab03ebf1/1625791567463/88691206860.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e94ee3b68d8f0f4bf9af39/1625902819990/2282528725.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e8a9149a0fc52ea427753f/1625860372136/7299697798.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ee5cd1e03b615e09901b80/1626234065897/16151684974.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60eca895af807f1e15290e03/1626122389515/digexisavosurefavoxase.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f37219e13ee9766609d54a/1626567193447/memorial_mall_movie_theater.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f47c6125edf12306666960/1626635361994/touching_my_body_song.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001241f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241F 16852 bytes
SHA-256: 855352188b937f9747932665cb5f164cf3be3fcb7a0a15f5b35fbe4d52fda489
font_02_sfnt_off00014fb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FB7 10204 bytes
SHA-256: b3ff7966215f57ab6ba3a015baa420ac4768e68cd1bf6e66ba46c317301ce6a7

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