Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c78a8612f17ed39…

MALICIOUS

PDF

74.2 KB Created: 2021-05-07 20:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5085ad5de8f003c2fd5551d015e566b5 SHA-1: 6a6b89663bb4752b131e86d723d990bcb9b5847b SHA-256: 8c78a8612f17ed39085822285f4d83656f381ccccab81b710051e39b0e2e5462
154 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious infrastructure, specifically a redirector designed to lead users to a phishing or malware site. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to contain keywords related to industrial equipment, likely a lure to attract targeted users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=sullair+compressor+oil+filter
    • https://cdn-cms.f-static.net/uploads/4374986/normal_5fd7ab4be0552.pdf
    • https://cdn-cms.f-static.net/uploads/4462688/normal_6060f5a971af0.pdf
    • https://cdn-cms.f-static.net/uploads/4421199/normal_601ef9c636ea2.pdf
    • https://cdn-cms.f-static.net/uploads/4370266/normal_60437ea46779d.pdf
    • http://gizigevom.mygamesonline.org/xubetofikodoxoxatixevuge.pdf
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdf
    • http://cyberlife.store/coding_all_in_one_for_dummies_reviewziac0.pdf
    • https://cdn-cms.f-static.net/uploads/4462974/normal_6047d21edb7ea.pdf
    • https://cdn-cms.f-static.net/uploads/4420238/normal_6054f89c86c37.pdf
    • https://static.s123-cdn-static.com/uploads/4486354/normal_5ff25d7f1ce6a.pdf
    • http://arenaprobet.com/black_and_decker_handy_steamer_plus_food_steamer_and_rice_cooker44es5.pdf
    • http://fobativ.mywebcommunity.org/domejuvabu.pdf
    • http://pusewuvi.medianewsonline.com/brain_anatomy_radiology.pdf
    • https://static.s123-cdn-static.com/uploads/4420766/normal_5ffc3026e956e.pdf
    • https://cdn-cms.f-static.net/uploads/4484821/normal_6058ed99771c4.pdf
    • http://help-feedback-amzn8.xyz/pharmacology_textbook_for_medical_students7ahj9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fb6c97b9-59ca-4840-891f-e46c055675b0/93390937373.pdf
    • https://uploads.strikinglycdn.com/files/4359f81e-2a37-4dec-9864-80eafa3092b7/how_many_carbs_in_a_soft_taco_tortilla.pdf
    • https://uploads.strikinglycdn.com/files/51851180-47cb-403e-b715-73fd860d9226/xexuri.pdf
    • http://wiwosotu.myartsonline.com/bapitavegapivi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e57a.bin
6381e5e7c06c248f5ba69e05dae8f924918d0258bad2077a123c4a8d50bc57fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE57A 5264 bytes
font_01_sfnt_off0000f74d.bin
54e4e9a7d1efd07c2af07e04bfd98f9ec782bbdcc613bcf4166bf79f04cc6d39		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF74D 10756 bytes

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