Malicious PDF — malware analysis report

Static analysis result for SHA-256 655bbbce531978cf…

MALICIOUS

PDF

81.5 KB Created: 2021-03-12 06:51:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: e249a537c0aef7126198a48b5d5a54e4 SHA-1: f2841ec1be9b39f511ca462e3e9f192bd4ac4628 SHA-256: 655bbbce531978cfe3708614eba1d90b8fb474fd1166ee2a16cbe5ef622bf760
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/award?keyword=ato+weekly+tax+table+2020+20+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4467019/normal_5fe8028d7adb6.pdfIn PDF document text
    • https://fezulenigi.weebly.com/uploads/1/3/4/4/134485980/3788407.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495271/normal_604629cae6370.pdfIn PDF document text
    • https://vazejaxos.weebly.com/uploads/1/3/1/3/131382607/351ee6060bced.pdfIn PDF document text
    • https://fuzewejobedogu.weebly.com/uploads/1/3/1/4/131482867/difojenojosiwarof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387061/normal_602c89f45f4b3.pdfIn PDF document text
    • https://folugaso.weebly.com/uploads/1/3/4/5/134503816/kugogidazi_kadapuvib_nawajaguruzeno_gesofujepaz.pdfIn PDF document text
    • https://guxitokos.weebly.com/uploads/1/3/2/6/132681611/jabadasuduligo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500910/normal_5ff63780f38dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387933/normal_60089bd3e96ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393521/normal_600f4577d5e7f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464869/normal_60023b02a2b0a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367622/normal_5ff04bb43b200.pdfIn PDF document text
    • https://kupelaranix.weebly.com/uploads/1/3/4/7/134729830/xiwezeseki.pdfIn PDF document text
    • https://popuverixi.weebly.com/uploads/1/3/1/4/131438274/5604669.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://30621b86-6952-4b41-80af-4d24d830bc7c.filesusr.com/ugd/122077_bbfdd8f942424068a1e545563785554b.pdf?index=trueIn PDF document text
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_7ed72cd1adf642609ea8602f76e779d0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4ab52a0-cd96-4bba-9a20-2ab6f35a6916/mesevatokenafinurutada.pdfIn PDF document text
    • https://ddb1515c-011f-4d6c-9a6c-b305a2039a85.filesusr.com/ugd/477ac5_0f4590020ef045f0a4958ad02d6ab58b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8566714-737c-4409-b0cc-1e623a362811/32856339338.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_off0000ff82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF82 5492 bytes
SHA-256: 43393383c644a244715104a8d366d11edb7c51848ece1ea592c19dc9a0303e88
font_01_sfnt_off00011266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11266 11196 bytes
SHA-256: 493ab212e04efa1e466a256b8e3b37cccafd08829716c4efe2d8ef1861d75434