Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9184c454c9c2ec8…

MALICIOUS

PDF

79.1 KB Created: 2021-06-04 20:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 0a011c59770dba1294514d9af004487e SHA-1: e0428081799e26d5833b524a2f934c85c8e46ed6 SHA-256: c9184c454c9c2ec8d32e30c6fbb1a510be11b3843e77019e21468c137844bbfc
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a large number of external links, identified as a link farm. The primary URL, 'https://synerhu.ru/pbw?utm_term=kitchen+sink+drain+plumbing+diagram+with+garbage+disposal', suggests a lure to disguise the malicious intent. The presence of multiple links to disposable hosting services and the ML classifier's high confidence score indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://synerhu.ru/pbw?utm_term=kitchen+sink+drain+plumbing+diagram+with+garbage+disposal PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475570/normal_6022bb0763cb1.pdfIn PDF document text
    • https://fuxozixer.weebly.com/uploads/1/3/4/6/134694245/f6f2ff523374667.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490129/normal_60109b73cb5a8.pdfIn PDF document text
    • https://rudadikisoma.weebly.com/uploads/1/3/1/6/131606677/sasig_gezofirak_xanidebemugixi_gezofumovonin.pdfIn PDF document text
    • https://wovigapugup.weebly.com/uploads/1/3/2/7/132710676/2597290.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393751/normal_604d01e0db0d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483362/normal_60037fdbbd285.pdfIn PDF document text
    • https://jaxurevinul.weebly.com/uploads/1/3/4/8/134868463/kegigez-julagixalujetu.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4414331/normal_60b686997f2be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504047/normal_602751d55e33e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378160/normal_5fde827938f20.pdfIn PDF document text
    • https://surejijal.weebly.com/uploads/1/3/4/5/134525532/juwuzuboxatajad.pdfIn PDF document text
    • https://ruzasamevu.weebly.com/uploads/1/3/4/5/134591323/d6e2b3.pdfIn PDF document text
    • https://bowizavonefuva.weebly.com/uploads/1/3/5/3/135338395/kuvazadato.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454545/normal_60617c4659e48.pdfIn PDF document text
    • https://xezujexowesujol.weebly.com/uploads/1/3/4/5/134502134/4206dc6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea01c52c-6b47-4a8d-b172-f6d2e922dfd9/avoid_dropped_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0b76b01-9cd1-45ea-b961-aedbec0b9db0/duvabojebipox.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_off0000f5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B9 5752 bytes
SHA-256: c0dfbc7052e92c79ce44721d05bfac9de1cd01006f59ea36390e6764d9ae493a
font_01_sfnt_off00010931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10931 11020 bytes
SHA-256: 25fd954356289a6912c16a657167f60ed92f501811e7606b6e6e09aa55d2694a

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