Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0047fcee1a926f7…

MALICIOUS

PDF

76.6 KB Created: 2021-03-01 20:19:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 242223f33fa371bf77cccc6e679954f5 SHA-1: a4a916a2fb5be0d8ec37d7d20eebf8c155d40bac SHA-256: e0047fcee1a926f7e339411cd74e099fbc4a7864bfcec283f6511f967afb92b1
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://yafferge.ru/strik?utm_term=what+questions+to+ask+in+an+interview+as+the+interviewee'. This, combined with ML classification and ClamAV detection, strongly indicates malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs. The presence of embedded URLs further supports the attack pattern of redirecting users to potentially harmful content.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/strik?utm_term=what+questions+to+ask+in+an+interview+as+the+interviewee In PDF document text
    • http://help-business-media.com/16076743396pbypu.pdfIn PDF document text
    • https://cdn.sqhk.co/gepeduvo/hjjh7De/lipuwesuleruvebagujo.pdfIn PDF document text
    • https://cdn.sqhk.co/xozirijor/jhhiiiS/47282539600.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450152/normal_60208e6662259.pdfIn PDF document text
    • https://cdn.sqhk.co/vabedesi/ghgcghh/zombie_fighting_maps.pdfIn PDF document text
    • http://bestita.space/properties_of_exponents_practice_worksheet8tchc.pdfIn PDF document text
    • https://cdn.sqhk.co/dilereku/rjcjaMl/electrical_drawing_symbols.pdfIn PDF document text
    • http://teachersaid.fun/cellulitis_idsa_guidelinesw79ss.pdfIn PDF document text
    • http://alphabitx.com/38195843593rc3a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448558/normal_5fd64e49a1205.pdfIn PDF document text
    • http://openchambre.xyz/esv_bible_app_costixqut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446394/normal_6010c6dd5305a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/32837194841.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/rukugekifenofinusir.pdfIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/balivonozororiz.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/birifezijax.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/44669600463.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/93788907436.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DA 4976 bytes
SHA-256: cea82e1539085bf8fd6b5a1ec0bb2cf8abda2f1d2f6949148ffe62bbf24385d7
font_01_sfnt_off0000f3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D5 10344 bytes
SHA-256: 1779dba982ffd4b3f307d8e4dd3149b8395359fb5cbef1d53308e223e7f8ab0f
font_02_sfnt_off000116fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FE 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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