Malicious PDF — malware analysis report

Static analysis result for SHA-256 08559bec07e95f6e…

MALICIOUS

PDF

86.3 KB Created: 2020-11-13 08:43:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 2ff937481854cd9a2ac499c40042bc49 SHA-1: af4e66793ee6f68bfcac320c9c7f0e78706d0229 SHA-256: 08559bec07e95f6e8d6ca680fcb8387b696ae755fce4e3f87b4dc4fcd44c78be
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The presence of 'utm_term' parameters suggests an attempt to track user engagement or disguise the malicious intent. ClamAV and ML heuristics confirm the malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/123?utm_term=digimon+world+ds+digivolution+guide+with+pictures PDF link annotation
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/3f3244003.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365562/normal_5f874f3dc8935.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369191/normal_5fa2bf86e7c97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416131/normal_5f9847131024b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445877/normal_5fa9a4c533c2f.pdfIn PDF document text
    • https://vogizezadu.weebly.com/uploads/1/3/0/8/130814341/posuxis-nidijomixuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408853/normal_5fa9ca72b5813.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379718/normal_5f8ee48c8ca95.pdfIn PDF document text
    • https://jobipidamefoji.weebly.com/uploads/1/3/4/6/134696246/22ed4e.pdfIn PDF document text
    • https://kupanonul.weebly.com/uploads/1/3/4/6/134682697/40a5e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371809/normal_5f8d157aeb7ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365601/normal_5f897ec981790.pdfIn PDF document text
    • https://raxiruzaxulam.weebly.com/uploads/1/3/0/7/130738564/9514745.pdfIn PDF document text
    • https://zesawomu.weebly.com/uploads/1/3/4/3/134321331/711413.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383688/normal_5f8bacc14ce06.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xozeb/las_venturas_gta.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_off0000f9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B8 3504 bytes
SHA-256: 79b5355961399b072a1cb7215f5175b2a92cdb55b5d6092290f2b738bf9c2ee1
font_01_sfnt_off00010627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10627 5428 bytes
SHA-256: 7fdc085b81406dad335646281246027a022c9a9e95a529cf9209d0a97e9b3888
font_02_sfnt_off00011895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11895 16476 bytes
SHA-256: be492231d8bc92fd663d0bbcb8b3f7c707eaf8e158a81883a6a0235e90a6c8af

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