Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf8cc93e5c413fc5…

MALICIOUS

PDF

76.6 KB Created: 2021-03-04 05:08:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 5a9d53bc1b42831dc125047bdad6ebc9 SHA-1: 7a6cd853cd97edd7d611acc892b4fbc6ce940e47 SHA-256: cf8cc93e5c413fc5e1139e342649e699ab224a497e1e0481dabf13fd1d218a66
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious intent. It contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to redirect users to potentially malicious content. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://soxebez.ru/123?utm_term=installing+maxi+cosi+mico+max+30+base PDF link annotation
    • http://telemprom.xyz/nidemetitojudukiqbuu.pdfIn PDF document text
    • http://nnorm-id.com/famaxejumizozemiloxujov8wal3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403262/normal_6008a75e06303.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460461/normal_6028f878c727c.pdfIn PDF document text
    • https://lutomired.weebly.com/uploads/1/3/5/3/135316507/7704855.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481403/normal_602004936d163.pdfIn PDF document text
    • http://lojasamericanasbr.com/44120774171y2j2x.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376619/normal_5fed1dd624603.pdfIn PDF document text
    • http://wowitaly.pro/gikogibuxamock45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453721/normal_601cf823ba404.pdfIn PDF document text
    • http://instapriz.online/react_code_formatter_in_vscode9lxvm.pdfIn PDF document text
    • https://vedexojofidas.weebly.com/uploads/1/3/4/5/134581268/5627327.pdfIn PDF document text
    • http://koteyarn.moscow/lumineers_ophelia_sheet_musickjwvw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486356/normal_5ff4e32800b49.pdfIn PDF document text
    • http://stroymarketmetal.ru/how_to_cook_cornish_hens_in_a_roaster3os0i.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37E 5476 bytes
SHA-256: 92ffe37dd7b2695b32f7645d85c043957cdf5324724f68ee98b061f36fc3f35c
font_01_sfnt_off0000f607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF607 2464 bytes
SHA-256: a4819ace0c68aea95bbe756288e19462c7f99d9feecd8c208b1fc591cd21e6da
font_02_sfnt_off000100e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E3 10536 bytes
SHA-256: 4fb7b8a85cbe90b3a74b11a91a436195681f7e99174aa7477e2b255348a5b394

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