Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff4374462c734ae9…

MALICIOUS

PDF

70.1 KB Created: 2021-03-27 12:11:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4c61c93e89addf9a238f3b1b87446582 SHA-1: 593f3374751142f7628666cfd1cc0eced387ed45 SHA-256: ff4374462c734ae96fcceddb0733ceadc6297b42c8ba277d72cd90b822035829
186 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 0.9996

Heuristics 6

  • 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.
  • 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.
  • 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://lozipotod.ru/award?keyword=tonality+and+atonality+in+sixteenth+century+music+pdf PDF link annotation
    • https://pupalizote.weebly.com/uploads/1/3/4/7/134716330/kerimudusiguw-wiwopazi-nager-wosafiro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459478/normal_602436988414a.pdfIn PDF document text
    • https://rikelakejif.weebly.com/uploads/1/3/4/8/134885243/tibipuwolevaja-bedowomipaloj-sefodabamanewad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422637/normal_5fdeabbf9fd82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482206/normal_605b81540e7ea.pdfIn PDF document text
    • https://pegugaxuxidugif.weebly.com/uploads/1/3/1/1/131164321/dekujuvu.pdfIn PDF document text
    • http://bitcoins-profits.com/964849660558qb5j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413474/normal_601772da658b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495550/normal_5fda2b34d3a44.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465703/normal_5feed4012e1f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470968/normal_602c87e8ce32d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425926/normal_602d62e6a2d38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406516/normal_602b600de9908.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375886/normal_600316b8833cc.pdfIn PDF document text
    • http://labiosdewonda.com/456895106105lh83.pdfIn PDF document text
    • http://keep-travel.com/josiriraziledetopop4jnxk.pdfIn PDF document text
    • http://ygrash.website/657942203783gt5t.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b1fc507-461b-409e-b328-2943ff127194/27933195514.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a9f9a93-6753-4080-9f46-3553679a6cd7/23895523685.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61303eee-7a4a-446c-ab5e-6499232b70e8/kasogojazetekituzer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/331d0807-1c00-4942-a401-601677c9211b/xiduzex.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_off0000d26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26E 5516 bytes
SHA-256: 7c4a076e3bc102621f4b2355a0ce976e0478c03401fe7e475f6c6d667d70ac43
font_01_sfnt_off0000e513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE513 10700 bytes
SHA-256: cf282041bc447c4369d80db13cc69a2006b7611ae507a20339c930f26b412acc

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