Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcc95686c9b53c6a…

MALICIOUS

PDF

71.9 KB Created: 2021-02-07 20:56:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 098c7bf8feeeeb50323440d57468c297 SHA-1: 236219a11c1e860de4683b5ecc32671c0965cc18 SHA-256: bcc95686c9b53c6a8576f0874a68d02132ade54d5c879dc02124c45eb44c8ee3
184 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure, specifically `https://yafferge.ru/123?utm_term=compound+microscope+diagram`. The document body, though obfuscated, contains metadata suggesting it was generated by wkhtmltopdf and includes the malicious URL, indicating a phishing or malware distribution attempt. The presence of multiple links to disposable hosting further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=compound+microscope+diagram In PDF document text
    • https://static.s123-cdn-static.com/uploads/4498678/normal_5fe5fbfaaf797.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481052/normal_5fec146f5358a.pdfIn PDF document text
    • http://help-business-media.com/75046562352jyfe4.pdfIn PDF document text
    • http://benosetib.iblogger.org/mariya_takeuchi_variety_album.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424036/normal_6014c921b55fb.pdfIn PDF document text
    • http://temppicture.xyz/linux_basics_for_hackers_downloa81sso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482418/normal_5ffdf7360dc97.pdfIn PDF document text
    • http://gramnews.xyz/angry_birds_movie_2_vr_under_pressure_review9ecxo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425772/normal_5ffb23da61167.pdfIn PDF document text
    • http://fruktovik.com/army_five_year_plan_template_excel2wvm4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493198/normal_5fe6a4f550252.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444877/normal_60141fcdcafd6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387233/normal_600712b92171d.pdfIn PDF document text
    • http://com-connexion.xyz/toni_morrison_beloved_summaryno4tl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://juropap.rf.gd/11689710351.pdfIn PDF document text
    • http://boxitevu.rf.gd/swan_lake_piano_music_sheet.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_off0000de70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE70 5264 bytes
SHA-256: 6dcdb9bfded95d774cd67cca5a2a74743e55db35eb3dd510a597a0bf5808d356
font_01_sfnt_off0000f039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF039 9928 bytes
SHA-256: 1ecdb37c3b545df09621de566e62d6ba702654a9e671607df44e69b91535a7fb

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