Malicious PDF — malware analysis report

Static analysis result for SHA-256 f01b4c04d9375b4e…

MALICIOUS

PDF

68.3 KB Created: 2020-11-29 08:42:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 14d7164a3adc2f4e8c6ce270945d9c7b SHA-1: 698348ed1ae4dac205caa956e263b12b402c788e SHA-256: f01b4c04d9375b4ed41c27d4de192553ba9f3be00c114a02c30f5352572beb75
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 0.9997

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://traffine.ru/strik?utm_term=dx11+vs+dx12+2020 PDF link annotation
    • https://jofowurifizowaj.weebly.com/uploads/1/3/4/6/134684387/eec1160bb.pdfIn PDF document text
    • https://rabepifisusix.weebly.com/uploads/1/3/4/8/134881283/df374ae6f.pdfIn PDF document text
    • https://nixawajumumija.weebly.com/uploads/1/3/4/3/134338940/xasutexujefapura.pdfIn PDF document text
    • https://bolefusugo.weebly.com/uploads/1/3/4/8/134868203/9566869.pdfIn PDF document text
    • https://wugebanog.weebly.com/uploads/1/3/4/7/134709888/xeropifetamesi-vezaxevadon-setaxivo.pdfIn PDF document text
    • https://jasesokotu.weebly.com/uploads/1/3/4/4/134499989/cd3ec.pdfIn PDF document text
    • https://mebudowafiwene.weebly.com/uploads/1/3/4/6/134629245/fefinukoxi.pdfIn PDF document text
    • https://vepezifu.weebly.com/uploads/1/3/4/2/134265798/xawadivaturetidev.pdfIn PDF document text
    • https://dokosoberodato.weebly.com/uploads/1/3/4/5/134597138/2354586.pdfIn PDF document text
    • https://sanuvexugivi.weebly.com/uploads/1/3/1/6/131606490/0f4937e54b27.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/sitozi/2020_calendar_printable_malayalam.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/orientation_du_def_malien_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/film_malena_full_movie_sub_indo.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_off0000c431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC431 4260 bytes
SHA-256: 8be22cbe604f2935240df71e7310de513ca9080b4802338f929ef484e634ca1d
font_01_sfnt_off0000d2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A8 10372 bytes
SHA-256: 441501f0082d96ca9cc80a1890faa2788cde3d5a1c401cc6b7ae002eafaf38a6
font_02_sfnt_off0000f61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61A 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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