Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf75a5f67d2effcd…

MALICIOUS

PDF

75.2 KB Created: 2021-05-21 05:41:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c9169aa38303e0e856b67162b69da50f SHA-1: d1b0f865d7ed76a90f7d3d82f93213a4c34ba833 SHA-256: bf75a5f67d2effcdff344a51c1ed25305bc0bb2542d439bfeeb8f1e037109160
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO scam. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

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://leonvi.ru/strik?utm_term=how+to+hack+washing+machines PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4416495/normal_5ff3d1635088b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414687/normal_5fc872b899bdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465719/normal_606d9d64e6e23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482880/normal_605604aae941c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369311/normal_5fcb2e99a04de.pdfIn PDF document text
    • https://zukolarosaku.weebly.com/uploads/1/3/4/6/134662459/xejevete_bebetupukutavo_jabig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494146/normal_604a9158515a5.pdfIn PDF document text
    • https://xoverepidagagit.weebly.com/uploads/1/3/4/4/134469055/4141803c77f18.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376598/normal_5ffe4f610d624.pdfIn PDF document text
    • https://bogigusojuvifu.weebly.com/uploads/1/3/4/3/134316749/wajasa_fiteriwelimi_gikulep_sarukuzakos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366381/normal_5fe9b6f2704ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389568/normal_5fd1a03c93447.pdfIn PDF document text
    • https://gitiritibew.weebly.com/uploads/1/3/1/4/131483488/zewekevivamurijuli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456122/normal_60505000b3441.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410447/normal_601fb2075071a.pdfIn PDF document text
    • https://rivixemip.weebly.com/uploads/1/3/4/6/134609840/164953.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/rorives/21450242236.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/68269703420.pdfIn PDF document text
    • https://s3.amazonaws.com/kiremefegonar/23186881541.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/how_to_get_quadratic_equation_on_ti_84_plus.pdfIn PDF document text
    • https://s3.amazonaws.com/nolarifaforuxop/antivirus_app_for_java.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_off0000e897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE897 5204 bytes
SHA-256: cbd8d9b23f868627a0347fa2e196a256df115ac274b0e4dbca79169759132e58
font_01_sfnt_off0000fa39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA39 10936 bytes
SHA-256: 7079b08e9dbb941ca20ec594e2998831ac8efc3cd1e44d3491791c41b5134262

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