Malicious PDF — malware analysis report

Static analysis result for SHA-256 632d19c540edf4f9…

MALICIOUS

PDF

77.2 KB Created: 2021-03-25 20:22:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 4c98a71087dfd356fb5c0e0eb17cef08 SHA-1: 22008fde3d520197ef91e7e48ad2204a1bd80ec3 SHA-256: 632d19c540edf4f9c4c0cac23ab4b1d1efb610d6bb9c913f23fb317ea30bb693
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file contains a large number of external links, many of which are algorithmically generated and point to disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO spam. The presence of numerous PDF links suggests an attempt to drive traffic to potentially malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ponafet.ru/strik?utm_term=premarital+counseling+near+me+church PDF link annotation
    • http://timecodes.net/vajabuguragozopenirukakintstfr.pdfIn PDF document text
    • http://want-seo.ru/business_analytics_program_whartonol76k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500887/normal_6011e2b21bfc4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425487/normal_5ff5b5e8c6b57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378856/normal_6006e77728fe2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403415/normal_5fcbc4e68ec9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403415/normal_602abfd4702f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365541/normal_6056c8dff0bd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450513/normal_6021291a7e181.pdfIn PDF document text
    • https://mafenipo.weebly.com/uploads/1/3/4/8/134879688/6505271.pdfIn PDF document text
    • http://keto-s1.com/basic_mechanical_engineering_conceptsl0ky6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448558/normal_5ff758a6a59bc.pdfIn PDF document text
    • http://artrosil.xyz/zixotujurufipabokofoxmcmog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455406/normal_5fe911d919f6d.pdfIn PDF document text
    • https://jifalutisapore.weebly.com/uploads/1/3/4/7/134772579/8081492.pdfIn PDF document text
    • https://mamexobupelo.weebly.com/uploads/1/3/1/3/131383482/6476862.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF058 5216 bytes
SHA-256: 158b8a10d6bc73922a99ad039871d8ae69a6b30efa53702c745b14fb918d087e
font_01_sfnt_off000101de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DE 11216 bytes
SHA-256: 1af3ba6ce41963a01b1d14bdaef996051a439b219a73011311d08f1d3cb5d58b

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