Malicious PDF — malware analysis report

Static analysis result for SHA-256 a375d91e920cddbd…

MALICIOUS

PDF

75.6 KB Created: 2020-12-27 05:35:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 5ee5710498e74b9a736815e5d0fa5944 SHA-1: 1e421985f19b154fff5fc7ce811b3568b6ecb62b SHA-256: a375d91e920cddbdf2d265d4edb33185a4922eec03ccd1ebbe789c52cf31adf4
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 Malicious Link

This PDF file was identified as malicious by multiple heuristics and an ML classifier. It contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document's content, though heavily obfuscated, appears to be a lure related to 'composted chicken manure vs cow manure', suggesting a phishing or spamming campaign. The primary attack pattern involves directing users to external, potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gettraff.ru/strik?utm_term=composted+chicken+manure+vs+cow+manure In PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/7360136.pdfIn PDF document text
    • https://kofusozefo.weebly.com/uploads/1/3/4/5/134515267/e600abe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369901/normal_5f979665244da.pdfIn PDF document text
    • https://kojovade.weebly.com/uploads/1/3/4/6/134681743/remineke.pdfIn PDF document text
    • https://pabenegoje.weebly.com/uploads/1/3/4/3/134348732/suwozetika_lozuni.pdfIn PDF document text
    • https://zelowomuguzak.weebly.com/uploads/1/3/1/3/131379017/7125326.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371791/normal_5fde90853aba4.pdfIn PDF document text
    • https://dodivimibo.weebly.com/uploads/1/3/4/3/134305777/945914ab26d807.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446260/normal_5fad77fba5858.pdfIn PDF document text
    • https://gozofuma.weebly.com/uploads/1/3/0/8/130874065/541746.pdfIn PDF document text
    • https://pesonukakevu.weebly.com/uploads/1/3/4/8/134863065/poralo-boxazo-pewafapu-kozoliwasugo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386839/normal_5fbaface40a95.pdfIn PDF document text
    • https://nuduxojobiri.weebly.com/uploads/1/3/4/6/134629521/roduperanezenumufa.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
    • 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_off0000de2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2D 5404 bytes
SHA-256: c644d948aed0e0d6088830539d16cd4018eba02793ad28f44da6832ea29d375e
font_01_sfnt_off0000f072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF072 10192 bytes
SHA-256: d2816b150ce228498a546b55f9dbd4555e3411747a0a021673f5737ebfd956c7
font_02_sfnt_off00011335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11335 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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