Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7bbc34052f8c913…

MALICIOUS

PDF

78.5 KB Created: 2021-03-15 00:02:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8465e63fc64675cdbcabf4b563834a92 SHA-1: 5bb04c795d8f8274c5089b738038f0e8a550db79 SHA-256: b7bbc34052f8c91339e91e9c7569b91b515f79d115b1ce6cd869e4e850ec45b4
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://dafemum.ru/award?keyword=bmtc+bus+route+map+pdf PDF link annotation
    • http://nitiwomifigurod.mygamesonline.org/32713900487.pdfIn PDF document text
    • http://sixesijilolun.mywebcommunity.org/how_to_write_a_digital_forensic_report.pdfIn PDF document text
    • http://zujuzerawijuk.medianewsonline.com/fijodume.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bodirinukamole.onlinewebshop.net/48024822516.pdfIn PDF document text
    • https://44f39d5c-a655-4437-91b6-62b11e148e71.filesusr.com/ugd/eb4c03_0e41ae1608b64e3c96f39d199cf21029.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/timeziso/kanoriwomejadurabelurewe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76d46416-6a49-4b15-aa8c-04af66968881/difference_between_grep_sed_and_awk_in_unix.pdfIn PDF document text
    • https://s3.amazonaws.com/tomaxade/riesgos_laborales_definicion.pdfIn PDF document text
    • http://rixuroruwe.myartsonline.com/97768794761.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e319f9a-959b-4e00-b3e5-bab98b5132b0/pidira.pdfIn PDF document text
    • http://gagugitebuf.atwebpages.com/how_to_test_transistor_using_analog_multimeter.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/bootstrap_form_template_w3schools.pdfIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/how_to_change_my_address_on_my_license_indiana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a1915d8-85d3-4225-97a6-80a52cb9b2e8/xutonunafogunopetaket.pdfIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/pekafixogadapegopofibivez.pdfIn PDF document text
    • http://zerowegujij.onlinewebshop.net/how_to_read_a_z_score_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9376f446-b989-4165-a569-dfe61bcaa784/amr_new_haven_human_resources.pdfIn PDF document text
    • https://2daccc73-8708-4113-a26a-4f38906335d9.filesusr.com/ugd/f65175_b6c8b29d7f5a49c196cf25f0dfe73bf7.pdf?index=trueIn PDF document text
    • https://968bac2e-1409-45a7-bd11-2c37eba47390.filesusr.com/ugd/c81504_81b850d142f142afad72017474711c0c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/pdf_to_autocad_dwg_converter_online_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/amazing_frog_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2896ecb-afe1-4cdb-99ed-ca58a45ce0f3/how_to_make_a_price_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/rowubunak/confluence_use_template_variable_in_macro.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36F 5456 bytes
SHA-256: 90da5f12240fe8295ae0e5127c95ef136e54ee8bb7834f80337fc59d9028c8be
font_01_sfnt_off000105df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DF 11016 bytes
SHA-256: bdab427a384522918cfe497e5dc9f923c0a95da87ddfc950b9c793d83baafa78

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