Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aeb8be307750e8f…

MALICIOUS

PDF

99.3 KB Created: 2021-05-01 19:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: df418b944133a27ba994deb739be0b79 SHA-1: 23735609f35a683118519123c4f52d6f90a6dfe5 SHA-256: 8aeb8be307750e8ff74341fd47633f10eadd0fcf318ce0ee274008237e24c91c
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a phishing lure designed to redirect users to malicious sites.

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://kuzutuzo.ru/strik?utm_term=cyrano+de+bergerac+important+quotes PDF link annotation
    • http://gusaluna.iblogger.org/89290999632.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408707/normal_603fdc60af8c2.pdfIn PDF document text
    • https://vekafikag.weebly.com/uploads/1/3/5/9/135986004/678145.pdfIn PDF document text
    • https://kuparalaler.weebly.com/uploads/1/3/4/6/134693450/vujomaxefo_gavuboletopi_xozokawulagibav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450747/normal_603189a355eac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481282/normal_602c1d9fc0661.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391649/normal_5ffb23d73e817.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408485/normal_5fe91ea3aee75.pdfIn PDF document text
    • http://rumukisizupew.iblogger.org/2702069889.pdfIn PDF document text
    • https://vulajavup.weebly.com/uploads/1/3/4/6/134683256/busamepup.pdfIn PDF document text
    • http://kemikekedig.iblogger.org/channa_mereya_ninja_full_movie_3gp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cda84be5-0c54-4c05-8389-97bb004c798d.filesusr.com/ugd/fa9f00_34c0b1797496420bb327a078ade3b917.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/391144b1-89f0-4eb2-bcad-410381dc78c4/13343709783.pdfIn PDF document text
    • https://b615eccc-4413-4b1d-8109-ede925130a83.filesusr.com/ugd/0994f9_e602f74aa5bd4064a5a9316b5a64c1d5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/widuxade/37215574998.pdfIn PDF document text
    • https://9fbeb193-358d-48fe-b9d9-45f8b63f6b3c.filesusr.com/ugd/ab67b9_3a3d98eb7313443db19c4c3353696634.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f87e01d-ddb8-44e2-a3e8-e1799cd3254f/mini_football_court_size_in_feet.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/amniotomia_indicaciones.pdfIn PDF document text
    • https://4fcc26ae-a476-48f2-98aa-cdc5c12f4544.filesusr.com/ugd/32d0e1_6e9a11d4fbd64f5ea69dd4c1a59118c6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sewamos/89540886840.pdfIn PDF document text
    • http://sugipuzafesam.rf.gd/93268582104.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_off0001478f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1478F 5636 bytes
SHA-256: e501b78831d256894661dc50d773737848146dd1c8c732282f21af2981f198b8
font_01_sfnt_off00015a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A96 10860 bytes
SHA-256: 413ab358202fdbdeff0d391318a479e851e14e629209678b8ab09d84a4bf807a