Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe1dc1f8ee0d032…

MALICIOUS

PDF

79.5 KB Created: 2021-06-08 03:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 6e615d01c02c064e4df3d6753afaf757 SHA-1: 5537defd1070ae18c57fadc07c2eba6d44d40054 SHA-256: 8fe1dc1f8ee0d032e12c607c6f770ca8e9d8be7b62897be8e513be6edec0bddd
226 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. It uses a password-protected-archive lure. 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 0.9997

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://jumiwimov.ru/123?utm_term=iti+basic+engineering+drawing+book+pdf PDF link annotation
    • https://nimomobef.weebly.com/uploads/1/3/4/4/134458394/79bfa.pdfIn PDF document text
    • https://mufunada.weebly.com/uploads/1/3/4/6/134623537/f80194cd0e5a564.pdfIn PDF document text
    • https://gufagopa.weebly.com/uploads/1/3/4/6/134660265/pevaxaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454556/normal_602ac672c554d.pdfIn PDF document text
    • https://besavikeneg.weebly.com/uploads/1/3/2/8/132815808/lavug_lalalimupibamod_kukogoja.pdfIn PDF document text
    • https://lepivigodegobuz.weebly.com/uploads/1/3/7/5/137505729/a613c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407749/normal_60522d395427c.pdfIn PDF document text
    • https://xovokemuzulu.weebly.com/uploads/1/3/4/7/134703915/nebalebuta.pdfIn PDF document text
    • https://nuniladolu.weebly.com/uploads/1/3/0/7/130775245/sigufuxira.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452839/normal_6060ba2a4ff1a.pdfIn PDF document text
    • https://bijejumutitin.weebly.com/uploads/1/3/1/4/131454352/7023881.pdfIn PDF document text
    • https://benanuvez.weebly.com/uploads/1/3/0/8/130813453/kasofipur_bexojaxi.pdfIn PDF document text
    • https://jabesukugadipo.weebly.com/uploads/1/3/2/8/132814964/pegapemi-fozojilopobuno.pdfIn PDF document text
    • https://luwigemo.weebly.com/uploads/1/3/4/5/134597726/1464981.pdfIn PDF document text
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/zanejidobom.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4413573/normal_60b4de1a8e654.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445337/normal_602d3d595dd0d.pdfIn PDF document text
    • https://balijijileg.weebly.com/uploads/1/3/4/5/134505585/2348579.pdfIn PDF document text
    • https://garotilalu.weebly.com/uploads/1/3/0/7/130739336/1242011.pdfIn PDF document text
    • https://kujivorel.weebly.com/uploads/1/3/0/7/130776875/mewufavelumipivido.pdfIn PDF document text
    • https://lonawapusar.weebly.com/uploads/1/3/0/7/130776864/dapotoxonaw.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_off0000f021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF021 5524 bytes
SHA-256: aad7e22c92fc0f59963d36b0b9ee1af897c353484a9c249490dea36e41e76082
font_01_sfnt_off0001030d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030D 13992 bytes
SHA-256: 4ca7d461572773ed449f31a138d092615ece1a107c7f05b0c4e587f382d196ab