Malicious PDF — malware analysis report

Static analysis result for SHA-256 6db5d5a5ee3f844f…

MALICIOUS

PDF

73.1 KB Created: 2021-02-21 07:15:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 47929c7217d33edf85b4b68bc2472978 SHA-1: 7c94583bec3a58cdd5669f7e1f1e1fdeb7460caf SHA-256: 6db5d5a5ee3f844f6bfc4942513868882888eda4fd9d2bda4568ce016b9e7353
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains and Weebly/cdn.sqhk.co subdomains, indicative of a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and heuristics point towards malicious content designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=music+notes+chart+clarinet PDF link annotation
    • http://instapriz.site/torebevorn17io.pdfIn PDF document text
    • http://astrohelp.space/tone_of_poem_ifn7gd2.pdfIn PDF document text
    • https://basedupapopulow.weebly.com/uploads/1/3/4/3/134344364/patapulijaro.pdfIn PDF document text
    • https://doxavigefixo.weebly.com/uploads/1/3/5/3/135391607/burefipo_fijikuwifu_talapedupev_motoxilakuwom.pdfIn PDF document text
    • https://cdn.sqhk.co/godereliku/Licoghv/rumble_fish_chapter_5_summary.pdfIn PDF document text
    • https://cdn.sqhk.co/xolovagi/jgeQjdf/darufexakopusimatizilo.pdfIn PDF document text
    • https://nivirijimukavut.weebly.com/uploads/1/3/2/6/132681164/6461315.pdfIn PDF document text
    • https://berizezemimuto.weebly.com/uploads/1/3/2/6/132695806/ece57d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369908/normal_602c9b42e3ac5.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/X5gggdk/nipinuvajalamukapimuro.pdfIn PDF document text
    • https://tadonajates.weebly.com/uploads/1/3/4/3/134319020/gosapapuxi.pdfIn PDF document text
    • https://tixatodaja.weebly.com/uploads/1/3/4/5/134507568/peroxavofop.pdfIn PDF document text
    • https://nopubogap.weebly.com/uploads/1/3/4/6/134667077/9586.pdfIn PDF document text
    • https://cdn.sqhk.co/tumupowe/h1Gj8hj/xaselubagamefazupotax.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://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_off0000d335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD335 4772 bytes
SHA-256: 46263670592a01a715022f5575589b422e6f07006c7d966c563fe56c426e4afb
font_01_sfnt_off0000e361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE361 11232 bytes
SHA-256: 007507d5492fd39dc5f7e3104488595b11cdeeaffe1b34ecf0365b510410d593
font_02_sfnt_off000109aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AA 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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