Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0f80db672214fa1…

MALICIOUS

PDF

73.4 KB Created: 2021-06-05 15:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: cb9c4dc6318cbb92a1e4688f02ee61bc SHA-1: 6db83b82140b4fb08c1331a027506e12c24787ad SHA-256: c0f80db672214fa19b5605d0c3489330845b73b0a83edd90d2ffb6c9e84874a6
186 Risk Score

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 0.9998

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://crysiq.ru/pbw?utm_term=modsy+design+ideas PDF link annotation
    • https://lurofajar.weebly.com/uploads/1/3/4/1/134131478/9510795.pdfIn PDF document text
    • https://wilexezixokesu.weebly.com/uploads/1/3/4/7/134764798/2a36b9.pdfIn PDF document text
    • https://wapexuji.weebly.com/uploads/1/3/5/3/135329723/faketer_jafugaz.pdfIn PDF document text
    • https://bulasenojagaroj.weebly.com/uploads/1/3/4/3/134357248/1a8a78c445a.pdfIn PDF document text
    • https://gipasutojemozup.weebly.com/uploads/1/3/1/3/131379868/wakegizosul_wodubimule_zuborulakobitel_benevipafi.pdfIn PDF document text
    • https://bonolofoguworow.weebly.com/uploads/1/3/4/6/134694868/8418583.pdfIn PDF document text
    • https://matamelo.weebly.com/uploads/1/3/1/3/131384575/130871.pdfIn PDF document text
    • https://ritidajadufe.weebly.com/uploads/1/3/4/6/134622671/kenitutom_gexenenozoma_bogem_disuzegoput.pdfIn PDF document text
    • https://rubitolagaju.weebly.com/uploads/1/3/5/3/135330326/wigivodutezip-fevuwafetojuga-vekiwexu-nijedesit.pdfIn PDF document text
    • https://fogujudusimasob.weebly.com/uploads/1/3/4/7/134713994/meluxavojubovat.pdfIn PDF document text
    • https://dazujaxika.weebly.com/uploads/1/3/1/4/131437396/jumanopafeza.pdfIn PDF document text
    • https://vefupidukubimaz.weebly.com/uploads/1/3/4/5/134597042/672f8b9c.pdfIn PDF document text
    • https://nuwuzeparagagux.weebly.com/uploads/1/3/4/8/134883197/5114578.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://uploads.strikinglycdn.com/files/4bcfebfe-36f9-4337-a443-5bca34a94293/83558149588.pdfIn PDF document text
    • http://mutoteja.pbworks.com/f/manual_istoria_comunismului_in_romania.pdfIn PDF document text
    • http://xorunezagu.pbworks.com/f/revolut_business_plan.pdfIn PDF document text
    • http://jetubabup.pbworks.com/w/file/fetch/144564180/my_virtual_girlfriend_mod_apk_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b28b655-40d6-474d-bd72-9eb753053ef5/the_heroes_of_olympus_paperback_boxed_set_10th_anniversary_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8108c8e-f9ce-45ef-b6a7-6a0ea81213f1/5614329619.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_off0000d799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD799 4680 bytes
SHA-256: a4871010b0776c05ac34f3f0b6a9b9783a82d914bd0d219ebd77c202050b023e
font_01_sfnt_off0000e799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE799 10248 bytes
SHA-256: 8762def762238868b70e7b55cab3e02588d6a7dc495e120890807cc5abd48ddf
font_02_sfnt_off00010ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB3 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361