Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4dfbc2c7d59a905…

MALICIOUS

PDF

72.9 KB Created: 2021-06-11 08:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 1143e066656ad93e90e79c0583a93755 SHA-1: 6f695cf9df45d92ad6b93663165cccc85dc51aa4 SHA-256: c4dfbc2c7d59a905a1e9b67b2ec45cdde6099e842dd917256a5a6004363a8011
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm designed to distribute malicious content or redirect users to phishing sites. The embedded URLs and the heuristic firings strongly suggest this document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://coretry.ru/pbw?utm_term=push+pull+legs+routine+pdf PDF link annotation
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/vorokukujigevo_dojijokom.pdfIn PDF document text
    • https://ponekuxu.weebly.com/uploads/1/3/4/7/134747949/100687.pdfIn PDF document text
    • https://xogudefimo.weebly.com/uploads/1/3/0/7/130775634/pivemabusud.pdfIn PDF document text
    • https://gefipozaxafuni.weebly.com/uploads/1/3/5/3/135312829/998559.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503584/normal_5ffe748442d34.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485828/normal_5fe1bed034627.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4461523/normal_60b1315f7777d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485572/normal_5fdc074a07c89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392215/normal_603b2d446fbba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421629/normal_603082403d6cd.pdfIn PDF document text
    • https://bewodopogogubak.weebly.com/uploads/1/3/4/8/134886142/sexebonegex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451545/normal_60410204214cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414161/normal_6056c5cad5502.pdfIn PDF document text
    • https://gubijebe.weebly.com/uploads/1/3/1/4/131483267/lasujilem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475208/normal_5ff883c7d87e5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gatunam.pbworks.com/f/bloons_td_6_money_hack_mobile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b43c91ec-fa00-4eff-ba3c-d7379e9a1bef/16457186262.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa468783-e843-49b5-8230-3f3d1969f024/formulas_para_area_y_volumen_de_figuras_geometricas.pdfIn PDF document text
    • http://visetululiv.pbworks.com/f/.pdfIn PDF document text
    • http://jiboduxoguv.pbworks.com/w/file/fetch/144874206/jonazat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e45025f9-c8f1-46c9-8c0d-2925b98a27a8/2001_chevy_silverado_stereo_installation_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bf96e56-8389-4ed6-b9f7-d2d4e928c176/lowrance_elite_4_hdi_chirp.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_off0000db34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB34 5096 bytes
SHA-256: c4f421bc904669d2ce12724d0e7dd965b9a57d6a552386c96b3dd991a9faf09c
font_01_sfnt_off0000ec85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC85 12932 bytes
SHA-256: 063f2c3c870a490b7468181ac47aefa50fc4c91521b767c1233c975bf538233a