Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b3785cb96f17cf8…

MALICIOUS

PDF

79.2 KB Created: 2021-07-15 11:39:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 48d283804d29d24bb9cdbeb107a30304 SHA-1: ce9396c5e3ca0279c58edca562ad6cf364568f51 SHA-256: 7b3785cb96f17cf815db19de5fd768f825e268f10360749fa4c9026a20d05694
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified an image lure linking to an SEO redirector, which is a common phishing technique. The embedded URL points to a Google feedproxy, which in turn redirects to a Squarespace hosted PDF, suggesting a multi-stage lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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/gPkW7oTCsL0/square?utm_term=what+is+the+code+use+to+check+bvn+number PDF link annotation
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e7e98d25441e1b3786950c/1625811341486/xivezirexoke.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec92ee973f9128ac6c1753/1626116846187/depatakopitesusesuta.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ed946ed2d00a35b8cf8da8/1626182767197/sports_writing_ppt.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e8472e2ea2332a69c29f68/1625835310877/55716414367.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e817cd80504e0a776c1bc2/1625823181486/ngn_to_php.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ed9dc91608af7c639d41cb/1626185161197/another_word_for_pecuniary.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e80f58afd06e4982ec65bc/1625821016650/davotimujusekezaxi.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ee41da6d75c50a5d440dc0/1626227162433/pimapejefogesaw.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60efd1741c2a3138378c780b/1626329460103/dumamabinulari.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec937444349d7bb06da9f5/1626116980620/pamphlet_for_art_and_craft_classes.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60efeed6177a4e2836d2b177/1626336982289/5_a_day_language_review.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60edc04137ddb5439bf3cde9/1626193985978/basic_electrical_engineering_by_bl_theraja.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec8f079c874e714248904a/1626115848036/magento_nulled_extensions.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_off0000d499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD499 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB0 10980 bytes
SHA-256: dae9b146a77938e77319bacd82e97cc2ebfbaa32ec931fcfa581ba932c24bfa7
font_02_sfnt_off00010603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10603 16300 bytes
SHA-256: 170e5b05ef865595c0faa853f9bcda95fe86d0a0d6bece226b4a9c56f8234f1e

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