Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a3273a47d512a2…

MALICIOUS

PDF

77.4 KB Created: 2021-04-03 09:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e75cbe932edf8eca5bf5e8bb5f1e3af3 SHA-1: eb0ec60646c77823c7518a01b4be1bf656fa9476 SHA-256: b3a3273a47d512a283d4335e5f75bbda8959d97fb1c32a060b8f606fec3dd926
206 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. It uses a callback-phone (TOAD) lure. 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 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://bologen.ru/wix?keyword=upmc+parking+lease PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470968/normal_602e5957d4bc0.pdfIn PDF document text
    • https://cdn.sqhk.co/donuvoduvedo/jaUjhji/3294976895.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383340/normal_5fe357ce5a28a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482216/normal_60581961b9b8a.pdfIn PDF document text
    • http://vostokzapad.su/94544617882noajl.pdfIn PDF document text
    • http://kanshoper.site/what_are_the_yama_and_niyamaw0lu3.pdfIn PDF document text
    • http://stopnutristrike.ru/char_broil_patio_bistro_240_electric_grill_coverydwtl.pdfIn PDF document text
    • https://cdn.sqhk.co/kurafuso/al1gWge/layton_drag_box_paver_for_sale.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420240/normal_5ffd3eab15408.pdfIn PDF document text
    • https://cdn.sqhk.co/mokopizel/gchagjh/fuwuvuronejefasoda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375196/normal_5fff9ca96fa7a.pdfIn PDF document text
    • https://cdn.sqhk.co/puwetudul/ouggggf/tornado_watch_and_warning_difference.pdfIn PDF document text
    • https://cdn.sqhk.co/susononuz/ijiujfi/cara_membeli_pulsa_lewat_gopay.pdfIn PDF document text
    • http://psychologyrelax.xyz/2004_ford_focus_hatchbackidym6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://f61a8d15-835b-4c36-a3db-e4ead73ab13f.filesusr.com/ugd/e9f5f3_65fbe5dc7ba44d0fafe13c8f11a51e2a.pdf?index=trueIn PDF document text
    • https://c0771fee-1ba5-4dbf-bba5-a775c3d44c03.filesusr.com/ugd/544e7e_de5be823aaeb48b19138e62aad04e9a4.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57C 4904 bytes
SHA-256: 47fa124d82723c6e86461e1472029c6c553c4a2551451d1e4ac848c71e49fa5b
font_01_sfnt_off0000f5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FB 10656 bytes
SHA-256: d6114c282eb4788dee9027dcd0d5208e3808011806b34b7eceff91458a7e251d
font_02_sfnt_off00011a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8A 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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