Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8555062d49cc822…

MALICIOUS

PDF

88.4 KB Created: 2021-04-14 03:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 782c79533be0fca6974c101e519eeab1 SHA-1: 676512636e85b712c28cacb54a34ea0dcea4fbc8 SHA-256: d8555062d49cc8222c8764b4404790c43d33c2f411aa8d1a04d6bc813aa8270d
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to potentially malicious sites, likely for phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-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://baarspo.ru/strik?utm_term=what+is+tough+solar+g+shock
    • https://dawasaga.weebly.com/uploads/1/3/0/9/130969366/sozuzerebod-virobivedetaxug.pdf
    • http://pukebebizadolu.mypressonline.com/96276471076.pdf
    • https://cdn.sqhk.co/gixixutiji/CJgi0jh/fonts_in_use_60s.pdf
    • https://cdn.sqhk.co/xagaxubibiz/hai1aru/muxelezunatomabukulod.pdf
    • https://gijorumofe.weebly.com/uploads/1/3/4/7/134764035/3646402.pdf
    • https://misajutedatid.weebly.com/uploads/1/3/4/7/134755713/76146.pdf
    • https://cdn.sqhk.co/vutenugade/Itbieja/sbi_card_statement.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://76f5a3e5-08d8-4581-9975-6c1b933a1845.filesusr.com/ugd/dbbd16_328bf5bcc4d247d3bc549fbfa2791c71.pdf?index=true
    • https://a3c35cc3-4a3f-4d41-ab51-8b3e4b114d30.filesusr.com/ugd/2b25b5_60987525c300413a9138f20762bdce7b.pdf?index=true
    • https://7fad2989-91b8-457c-89bc-9a0e7aeef19f.filesusr.com/ugd/b03ff3_2e493a6cff9843d9bd9503fd4f27303d.pdf?index=true
    • http://kesolimasakifi.myartsonline.com/18810128451.pdf
    • https://92ddf5cc-4ce7-4caf-b117-8241c553a727.filesusr.com/ugd/42bae0_83ad4639d6164b70982515c270da755d.pdf?index=true
    • https://feedbc21-cb93-402c-9ae2-3476589645d2.filesusr.com/ugd/f3ecbe_10d932a159d04f18b92ce3bc6804220a.pdf?index=true
    • 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_off00011b49.bin
54b667a985a2301e56a757c6c713b872a0f0122353ab158a10fcb5f60ace5653		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B49 5140 bytes
font_01_sfnt_off00012ccc.bin
be6d1cc905ebf22aa6ccd36a8f61ce5faf8f3ddf8dc2b6e01a7954d45033f07b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCC 11364 bytes

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