Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb3c594eaefc9c4…

MALICIOUS

PDF

67.1 KB Created: 2021-04-03 21:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1545f20237feae02466659a184bb1a67 SHA-1: e48f78ac477dc9a65c7d2940efce221479cd3b9a SHA-256: cdb3c594eaefc9c4768214170cc5f96bfbc2cefb578154a1a88b07c124f020e5
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDF files, indicating a link farm or phishing infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8213

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://pelibifir.ru/strik?utm_term=damn+good+advice+for+treasurers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4383692/normal_600968cfeaecc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475852/normal_6017b20a1140b.pdfIn PDF document text
    • http://2220202.ru/cliff_swallows_and_barn_swallowsai81y.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502833/normal_5ff03419cfc0a.pdfIn PDF document text
    • https://pigumetazemebet.weebly.com/uploads/1/3/0/7/130775485/kewenebogemuwo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495391/normal_600cab8a5fdec.pdfIn PDF document text
    • https://nematoluzi.weebly.com/uploads/1/3/1/4/131409841/2ef466d023e.pdfIn PDF document text
    • https://lumixomenuvaw.weebly.com/uploads/1/3/4/7/134745504/pajumotamotapis-dakijepidijuj.pdfIn PDF document text
    • https://ralufuluwifo.weebly.com/uploads/1/3/0/9/130969066/cf5a0a0d4df80.pdfIn PDF document text
    • http://clebohets.xyz/taredawasodisuxiwasisaqlh4.pdfIn PDF document text
    • http://ledimpress.biz/908872216579ohk9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/nda_bjp_party_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/kivizi.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/sifiradeketutafipew.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/cisco_ise_2._4_patch_8.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/blend_words_worksheets_for_grade_2.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/cheng_punjabi_song.pdfIn PDF document text
    • https://fc9a8e44-b853-4378-b933-957c6fa9ceda.filesusr.com/ugd/1da781_ce43baa1056343139e19a2ef5eef3508.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/sajevegez.pdfIn PDF document text
    • https://a82c121c-2200-4cd7-aff6-47cf910fdadb.filesusr.com/ugd/117c17_eeb612ca5c27453eb055924202e54e4f.pdf?index=trueIn 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_off0000d072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD072 5368 bytes
SHA-256: 76ee97a37f7d4cfd12ffe8e252bdf9ad6601375898b37c84bd99c4ed918a4657
font_01_sfnt_off0000e2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B2 11080 bytes
SHA-256: 2a48862e67a7cf87fb8bf76ec56a8887f38d7b95c9556699fe6cbb3af887c7fd

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