Malicious PDF — malware analysis report

Static analysis result for SHA-256 479d8dd7cb93085a…

MALICIOUS

PDF

65.5 KB Created: 2021-03-18 20:37:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c53a301a9d53dddb384d574c3164aebb SHA-1: d216a6ad989b241d36164a7ff72cdc170c041643 SHA-256: 479d8dd7cb93085a32ea8c3a89924573aae1c7a831bb7b23e6e142b1d5ec6c18
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external links to other PDFs hosted on disposable domains, suggesting a tactic for SEO manipulation or distributing phishing content. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm strongly suggest a phishing or malicious redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/wix?keyword=gas+laws+test+answers PDF link annotation
    • https://puvojokuxika.weebly.com/uploads/1/3/5/9/135985507/miribodisagur_zipuwawi_jijanuxotixepub_lawevan.pdfIn PDF document text
    • https://cdn.sqhk.co/tawibonikigo/ngejgB3/titanijubozizi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371005/normal_6049512c1ba7e.pdfIn PDF document text
    • https://jedifubebevaze.weebly.com/uploads/1/3/4/8/134873515/66d464b7462c.pdfIn PDF document text
    • https://cdn.sqhk.co/kobadaxo/iZoibdP/funny_gift_ideas_for_friends.pdfIn PDF document text
    • https://cdn.sqhk.co/vetelojid/iTwjODI/77518350857.pdfIn PDF document text
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/6156925.pdfIn PDF document text
    • https://cdn.sqhk.co/tatonabufule/digijhf/15008636074.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454822/normal_60135cda3c2d4.pdfIn PDF document text
    • https://xilivixawigilu.weebly.com/uploads/1/3/4/6/134672458/9781120.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427093/normal_600910190fb67.pdfIn PDF document text
    • https://pituluwo.weebly.com/uploads/1/3/1/4/131437949/raruwakagibubex.pdfIn PDF document text
    • https://judozolu.weebly.com/uploads/1/3/1/4/131407514/lovilupozuzax_vuruxitu.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/U7ii6kS/xulitosajar.pdfIn PDF document text
    • https://bomovote.weebly.com/uploads/1/3/5/3/135398027/notawow_palafodop_piradiwigo_fuwix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501054/normal_604b10da34c83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420019/normal_60280c0232058.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387033/normal_5fe41c787b779.pdfIn PDF document text
    • https://cdn.sqhk.co/muwazubivotu/tja2hi5/70001330704.pdfIn PDF document text
    • https://cdn.sqhk.co/duwenaxiseve/mQ3VYib/mutogobabevofamas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC542 4800 bytes
SHA-256: c8f42ab05906bccc06b6536ed3aaf959d266092dc7c80d4d6030476b90edcb47
font_01_sfnt_off0000d5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B3 10236 bytes
SHA-256: 7fac1e9989f99314efca54e573b7eb2054fecb041ce335d9715fdf6e891e5795

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