Malicious PDF — malware analysis report

Static analysis result for SHA-256 1005c2db050aa34b…

MALICIOUS

PDF

87.9 KB Created: 2021-03-11 21:01:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 55d8eec7e255e8f110e020f20192b0d7 SHA-1: 58843b065c6c48c92ff0996a3e9fa7e46ef273b1 SHA-256: 1005c2db050aa34b42adf596f8028fea27e79569884b09b0dd67383de25cfb97
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It contains a significant number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, https://baarspo.ru/strik?utm_term=what+are+the+hardware+component, is likely part of the malicious infrastructure. No scripts were extracted, but the PDF structure and numerous external links indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/strik?utm_term=what+are+the+hardware+component PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425723/normal_600f191c8706c.pdfIn PDF document text
    • https://zujefimobob.weebly.com/uploads/1/3/1/4/131453463/tuzejowamavifuxo.pdfIn PDF document text
    • https://cdn.sqhk.co/lanumakefu/gff38o6/66250321302.pdfIn PDF document text
    • http://indonesia2health.online/994505734804zr7r.pdfIn PDF document text
    • https://xoxudepibedewem.weebly.com/uploads/1/3/5/3/135317482/babejebanawene.pdfIn PDF document text
    • https://vaxudiku.weebly.com/uploads/1/3/4/7/134709892/zivujaxet-sebefad-kebasodilufu-fevumewijivawut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501777/normal_6042ee62ebf16.pdfIn PDF document text
    • https://cdn.sqhk.co/taxodisilif/hofjjC8/48961097094.pdfIn PDF document text
    • http://momentshop.website/10004239071f5veb.pdfIn PDF document text
    • http://zesamoa.online/best_desert_island_survival_movies53prb.pdfIn PDF document text
    • https://potemoguzoka.weebly.com/uploads/1/3/4/6/134646314/7341551.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383467/normal_5fd63b6d92d66.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379971/normal_5fffa29e4c59c.pdfIn PDF document text
    • https://rarinuda.weebly.com/uploads/1/3/5/3/135349313/c27ad.pdfIn PDF document text
    • https://cdn.sqhk.co/guwaloxipete/hgbjhwr/aafes_ps5_pre_order.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://18b62485-dce0-4e35-9712-b1d1f13fcb23.filesusr.com/ugd/296484_20df46c06029438ba96794ea929b321b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/tusiromi.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/maths_syllabus.pdfIn PDF document text
    • https://6376acfe-5884-4251-b3d5-19a03c044549.filesusr.com/ugd/de3d83_5705a4e692384bda88c17599268113bc.pdf?index=trueIn PDF document text
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_87180547f5724fcca4a67d78f45a52f5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/aniara_poema.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_off00011c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C54 5208 bytes
SHA-256: 955cbc16618468cb65b480bdf1bfe581052be337f406efc0d6a192f46c55ac04
font_01_sfnt_off00012dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFB 10692 bytes
SHA-256: e099253609a5baca856b1c01e76b05032eff5b485b726e61bf5678b6b91ccd53