Malicious PDF — malware analysis report

Static analysis result for SHA-256 f85bd8fc5048454d…

MALICIOUS

PDF

75.9 KB Created: 2021-02-28 22:56:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: da5d6c34ff138e942a2d69d3ecaf1420 SHA-1: 23b0e9c1c208288be6fe9c315581652e3c1bc458 SHA-256: f85bd8fc5048454d9cfb72b3992fe622501416f28b8b9fab812896efa75ddcb1
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. One prominent URL, https://mezovuduw.ru/strik?utm_term=casio+rangeman+gw9400-1+as+mb6+twin+sensor+wristwatch+black, appears to be part of this redirection scheme. The document body, though heavily obfuscated, contains metadata related to product listings, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/strik?utm_term=casio+rangeman+gw9400-1+as+mb6+twin+sensor+wristwatch+black PDF link annotation
    • https://vafarisitoguv.weebly.com/uploads/1/3/0/8/130874489/pidanifabu.pdfIn PDF document text
    • https://wikuxokogex.weebly.com/uploads/1/3/1/8/131872144/vujoduvepeniw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417037/normal_601d61399af9f.pdfIn PDF document text
    • https://nusimilanagazi.weebly.com/uploads/1/3/1/4/131454102/gojavinexulaluxuk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502920/normal_5ff92f8cc6d3f.pdfIn PDF document text
    • https://rimixobavi.weebly.com/uploads/1/3/3/9/133987070/2800834.pdfIn PDF document text
    • https://cdn.sqhk.co/bufudoraxala/6ihiaEQ/onedrive_365_business.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469860/normal_5fe148c626fe9.pdfIn PDF document text
    • https://cdn.sqhk.co/diratukuz/jhi7ehf/world_of_darkness_rpg_review.pdfIn PDF document text
    • https://xozejobe.weebly.com/uploads/1/3/1/4/131406614/sunolowetir_jafojawaro_derum.pdfIn PDF document text
    • http://vikiduxa.mywebcommunity.org/multiple_linkage_model_explained.pdfIn PDF document text
    • https://kafememum.weebly.com/uploads/1/3/4/6/134616831/wafoperoxiwagaj.pdfIn PDF document text
    • https://pixasarajesuwov.weebly.com/uploads/1/3/4/6/134688766/3694889.pdfIn PDF document text
    • https://cdn.sqhk.co/xiroxozalal/brjgrWh/gemixaxitu.pdfIn PDF document text
    • https://linefalaxig.weebly.com/uploads/1/3/2/6/132682404/foxute.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365655/normal_60027e19b53fb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bogalibamadom.myartsonline.com/fadudusojebegu.pdfIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/64207082251.pdfIn PDF document text
    • http://mifojizu.myartsonline.com/70037928390.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72D 6040 bytes
SHA-256: 46b89c2ff1fbdfcd758e24bc0a90af02d0dc2183558dff065b4e984fe254d851
font_01_sfnt_off0000fbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAD 11080 bytes
SHA-256: aac7dc2de4d2fc0dc4ba1fd356e8b58495629024ee47d9f1172a0f6e8ee26dec

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