Malicious PDF — malware analysis report

Static analysis result for SHA-256 0df63aff4a988a89…

MALICIOUS

PDF

81.1 KB Created: 2021-04-10 00:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 56a969b95b79b911108b782d4d5b1431 SHA-1: 74817e74449f0a73b45c9b5b477fe96fd8e865f0 SHA-256: 0df63aff4a988a89b6f4458123d7257a735880c2bd0e109db2505564628159d4
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 hosted on disposable domains, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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 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://golowaki.ru/strik?utm_term=how+to+disassemble+a+kenmore+stackable+washer+dryer
    • https://jajixawu.weebly.com/uploads/1/3/5/9/135992574/92273c12ca2d4.pdf
    • https://gubizotalu.weebly.com/uploads/1/3/1/8/131871644/kekevanekaxabojel.pdf
    • https://zomimodobi.weebly.com/uploads/1/3/0/7/130739583/doruvi.pdf
    • https://static.s123-cdn-static.com/uploads/4468286/normal_5ff8d65c17ba8.pdf
    • https://fomutifimo.weebly.com/uploads/1/3/4/5/134594787/2b2cbdbd55.pdf
    • https://pipabujul.weebly.com/uploads/1/3/2/6/132680817/dbd0e.pdf
    • https://cdn-cms.f-static.net/uploads/4450439/normal_602156a14309e.pdf
    • https://cdn-cms.f-static.net/uploads/4503197/normal_60698b5466490.pdf
    • https://zowajapizuxazo.weebly.com/uploads/1/3/0/9/130969341/2124848.pdf
    • https://static.s123-cdn-static.com/uploads/4365525/normal_5fcfa3eabd36d.pdf
    • https://rejovofutilux.weebly.com/uploads/1/3/1/4/131484728/1835660.pdf
    • https://cdn-cms.f-static.net/uploads/4415756/normal_5fe75c59c090b.pdf
    • https://putavoguxula.weebly.com/uploads/1/3/5/3/135325624/didum.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://42e65457-ec34-4553-8979-78b6e302f774.filesusr.com/ugd/f1976d_21ac127b8b2340f1b98fb0b07149f032.pdf?index=true
    • https://ac4cd5cf-e861-4b1b-a585-e47049f737a6.filesusr.com/ugd/843280_d0359fd4671045bebaf6d487d393b0eb.pdf?index=true
    • https://s3.amazonaws.com/wizedumi/38058262600.pdf
    • https://s3.amazonaws.com/venunamazozuzo/mipikikas.pdf
    • https://s3.amazonaws.com/zuniverijesud/44983662855.pdf
    • https://s3.amazonaws.com/sigobija/nikon_dx_lens_on_z6.pdf
    • https://s3.amazonaws.com/tapexiw/76772293134.pdf
    • https://s3.amazonaws.com/wolina/18239904424.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010001.bin
498240fdb530b571625625c25c2ad1b7d1a63e59633b1d6e0ab6accef4c5acd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10001 5540 bytes
font_01_sfnt_off000112bc.bin
5cb1020f78251e006f5c155721078eb8498afaec18b9e3835ba3293d28171999		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112BC 10560 bytes

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