Malicious PDF — malware analysis report

Static analysis result for SHA-256 c082fe35c3ab7474…

MALICIOUS

PDF

84.0 KB Created: 2021-02-17 20:15:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 13282651604f4f0dafd1a0876b4a07f3 SHA-1: a20593064106234a5aff73422813c911b91e5707 SHA-256: c082fe35c3ab74743742caa7c7bf8b1c1c8cb382b9ab40d6ef02e66002e41181
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/123?utm_term=what+is+the+purpose+of+report+writing+mcq PDF link annotation
    • https://cdn.sqhk.co/nemuvefik/iaJ0JDS/digestive_enzymes_benefits.pdfIn PDF document text
    • http://nokirixako.iblogger.org/uc_browser_mini_free_old_version.pdfIn PDF document text
    • https://luwegojozokozop.weebly.com/uploads/1/3/0/9/130969796/fugam.pdfIn PDF document text
    • https://rojuligu.weebly.com/uploads/1/3/0/9/130969709/vevubuwejosu-tenam-fezigagowag.pdfIn PDF document text
    • https://sikenobavusemel.weebly.com/uploads/1/3/2/6/132682861/4018825.pdfIn PDF document text
    • https://rudiwiguxovo.weebly.com/uploads/1/3/5/3/135317070/lafinilefolubaziwit.pdfIn PDF document text
    • https://gozerezujokosas.weebly.com/uploads/1/3/4/8/134856803/5120244.pdfIn PDF document text
    • https://fekebejoluxoji.weebly.com/uploads/1/3/4/3/134309121/7153630.pdfIn PDF document text
    • https://tuboxivodase.weebly.com/uploads/1/3/4/3/134387713/lujubazun.pdfIn PDF document text
    • https://cdn.sqhk.co/jowowibow/bq4ickN/nakodonoxodigemupatez.pdfIn PDF document text
    • https://fojifipavubi.weebly.com/uploads/1/3/4/6/134618349/5460804.pdfIn PDF document text
    • https://lopamazaveseku.weebly.com/uploads/1/3/4/6/134643240/jirex.pdfIn PDF document text
    • https://cdn.sqhk.co/kadeposamo/jhhjTI1/moxekasawabon.pdfIn PDF document text
    • https://femixazate.weebly.com/uploads/1/3/4/3/134363246/kesefo.pdfIn PDF document text
    • https://mezepobavufu.weebly.com/uploads/1/3/4/7/134717124/xuxanu-monibamuduvuxu-rewapenunivuxa-ruwatok.pdfIn PDF document text
    • https://cdn.sqhk.co/letopoto/iQZ5WNB/nijanijoxevinefaresig.pdfIn PDF document text
    • https://cdn.sqhk.co/wemofisejaf/OmjhbYn/80836346789.pdfIn PDF document text
    • https://voperupazekeko.weebly.com/uploads/1/3/4/5/134505312/sujixogobopudamawazi.pdfIn PDF document text
    • https://wigadanoj.weebly.com/uploads/1/3/4/4/134404864/teren-malegar-tuwinumukidasif.pdfIn PDF document text
    • https://nonejekorozu.weebly.com/uploads/1/3/4/1/134108542/1653d0dfb72eb.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
    • http://wisunomimat.epizy.com/3d_architecture_software_free.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_off0000fe36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE36 5512 bytes
SHA-256: 3261784559dc1e40824883c3043d7753c432d8ed20e32984bc8712020587d543
font_01_sfnt_off000110e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E0 10504 bytes
SHA-256: ad3c5635146559f483d444078ecb0957d8d69f260931992f1cabdada88c5a3cc
font_02_sfnt_off000134c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C0 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71