Malicious PDF — malware analysis report

Static analysis result for SHA-256 abbfcb96e56cbec6…

MALICIOUS

PDF

76.9 KB Created: 2021-02-09 15:45:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 106cf1f127736d87b552be1b23128d46 SHA-1: 4c0712d3c990a17aaeb0272d290eccfbd626ee5e SHA-256: abbfcb96e56cbec6f0e9304c9e57a82dbf091359c7350eb7729332387ff1d865
244 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to disposable hosting and redirector infrastructure, indicating a link farm designed to distribute traffic or host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is indicative of a malicious distribution method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wb?keyword=bbc%206%20minutes%20english%20podcast%20pdf In PDF document text
    • https://cdn.sqhk.co/jedugifaxido/IhhShiv/smart_locator_386.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418365/normal_600bb317cc8be.pdfIn PDF document text
    • https://vibebivenef.weebly.com/uploads/1/3/1/4/131412032/tewikagonosi_xutet.pdfIn PDF document text
    • http://3gusevshop.website/rs_party_hatsd5a5r.pdfIn PDF document text
    • https://lilugotowo.weebly.com/uploads/1/3/2/7/132711957/b8234e.pdfIn PDF document text
    • https://banafazag.weebly.com/uploads/1/3/4/3/134325205/dedax.pdfIn PDF document text
    • https://tinuxitimo.weebly.com/uploads/1/3/4/7/134748051/jizotokefefera-zavujixuw-terizo-gipifanitalow.pdfIn PDF document text
    • https://kopiwuzurori.weebly.com/uploads/1/3/1/3/131398237/1f79516025ba.pdfIn PDF document text
    • https://foramawebor.weebly.com/uploads/1/3/1/4/131410370/bevutesanefapifonal.pdfIn PDF document text
    • https://kesozelakix.weebly.com/uploads/1/3/5/3/135300748/tufanewe.pdfIn PDF document text
    • https://cdn.sqhk.co/womawuxinuge/XgjjRji/fawelenazawiburifumuw.pdfIn PDF document text
    • https://vadewowiruku.weebly.com/uploads/1/3/1/3/131382700/bofal.pdfIn PDF document text
    • http://profaudit32.ru/apk_4gb_ram_booster_pro_v1._2mt5m9.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://s3.amazonaws.com/zerejibixupav/treatment_guidelines_for_necrotizing_fasciitis.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/autocratic_leadership_vs_democratic_leadership.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CC 5696 bytes
SHA-256: 2ddee2dd8755890aedfc40e456e9b27b1b6e279f86bed70237790ad12cd01352
font_01_sfnt_off0000f5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F3 10200 bytes
SHA-256: cb7ea7d1204bb68cab79df13a2b3f3b1c03c95aa33b18eff6cb4db81f942592c
font_02_sfnt_off000118e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E2 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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