Malicious PDF — malware analysis report

Static analysis result for SHA-256 c95df3dbab9b5227…

MALICIOUS

PDF

81.3 KB Created: 2021-05-12 14:32:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 62ff4c5a4cfcc11aa3bbf0e05a20c3e8 SHA-1: 9ab7d278661e262c2e4472207bd424851a93bf1e SHA-256: c95df3dbab9b5227eb01eb14f3182b5483b5b81facb43c701b3c0e67ba9a0b72
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 0.9995

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://jacksth.ru/strik?utm_term=zelda+manga+review PDF link annotation
    • https://cdn.sqhk.co/nuxazagugura/bggAL2g/black_and_white_wolf_wallpaper_hd.pdfIn PDF document text
    • https://cdn.sqhk.co/kukojuvata/NZigfYl/jadur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419437/normal_605aa0de077ca.pdfIn PDF document text
    • https://mutazodot.weebly.com/uploads/1/3/0/8/130874237/2417002.pdfIn PDF document text
    • https://metapuxin.weebly.com/uploads/1/3/4/6/134633213/5eb79e.pdfIn PDF document text
    • https://dekoreriso.weebly.com/uploads/1/3/7/5/137501726/sesimuvip_lidebujad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468261/normal_5fed17432d989.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366660/normal_6025951bdb7f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427287/normal_5ffd2f327b94e.pdfIn PDF document text
    • https://fapufeloku.weebly.com/uploads/1/3/1/0/131071019/1ebf881fad7bd1a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380392/normal_5fca3c7e12e8a.pdfIn PDF document text
    • https://degijidugaf.weebly.com/uploads/1/3/4/8/134886203/vijotibig_pirime_tofavolowuguri.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/najubu/88312602617.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1006e73-b9ac-444d-9285-33d760850ed9/swtor_patch_error.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/best_skaven_lord.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d709721b-2015-4fc1-b10a-a1aaaeab218b/serorosagi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed26bc93-da05-4edc-954d-e83ecfe0ecdf/using_a_router_for_half_lap_joints.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c2f09dd-d13d-4fb6-8475-ed3e2b1f280b/43975470884.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfa63626-015f-44b7-9233-459341d98939/33282888839.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/61952483357.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9a8a9d1-448b-4ff8-9b7e-ef9d17be853a/will_there_be_a_odd_thomas_2_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da26b2d8-4efd-4f1d-a90f-1b52828cc53d/61776774894.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_off0000f410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF410 4676 bytes
SHA-256: 9e8d2db2161d9c1b4e6c69b4fa2b48438ae5650a299f14cecd465ea2165d528e
font_01_sfnt_off000103d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D6 10580 bytes
SHA-256: ab766f1c9cb71bdc2ac344f5724ae88d852db191b38d18873fc5e1a7b90cdc42
font_02_sfnt_off00012806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12806 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c