Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8e152c64bea0be2…

MALICIOUS

PDF

75.9 KB Created: 2021-05-25 13:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d4f6d6c773e002c1c0f55ec05124911 SHA-1: cf977d235936951e5d61a0559f08b7c128699708 SHA-256: c8e152c64bea0be244a79416d7e8d04336ebe40d09056521ae40262fb5d3e0ad
126 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The primary link, 'https://crophysi.ru/strik?utm_term=how+to+get+deleted+emails+back+in+outlook+2016', is presented as a solution to a common user problem, likely to entice clicks. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • 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://crophysi.ru/strik?utm_term=how+to+get+deleted+emails+back+in+outlook+2016
    • https://cdn-cms.f-static.net/uploads/4426280/normal_603f4baaee669.pdf
    • https://static.s123-cdn-static.com/uploads/4443803/normal_5fef8fae677c1.pdf
    • https://cdn-cms.f-static.net/uploads/4455174/normal_60684062e2ea1.pdf
    • https://logukevagas.weebly.com/uploads/1/3/4/5/134507161/tupito.pdf
    • https://cdn-cms.f-static.net/uploads/4453103/normal_601f7f079b0cc.pdf
    • https://fukidupedogof.weebly.com/uploads/1/3/2/8/132814182/pisipupewijofavovov.pdf
    • https://static.s123-cdn-static.com/uploads/4368266/normal_5fc7650869cf5.pdf
    • https://static.s123-cdn-static.com/uploads/4414175/normal_600045449bd37.pdf
    • https://xewezepi.weebly.com/uploads/1/3/0/8/130813550/pezigebazedim.pdf
    • https://nutikatike.weebly.com/uploads/1/3/4/6/134601603/sobemazogarabamoxis.pdf
    • https://cdn-cms.f-static.net/uploads/4379846/normal_602fbbaad5ef2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lakujusitejojet/ataxia_espinocerebelosa_tipo_1.pdf
    • https://s3.amazonaws.com/zamuriza/63744831042.pdf
    • https://s3.amazonaws.com/gedimuta/liferulagefuzepuzuvo.pdf
    • https://uploads.strikinglycdn.com/files/2be9903a-1ef0-4f75-b601-9caaca02fd60/what_does_giving_someone_bunny_ears_mean.pdf
    • https://uploads.strikinglycdn.com/files/5e2f279a-7dbc-4d11-99e2-9b9495512516/jegaruletudugipu.pdf
    • https://s3.amazonaws.com/wajufifenoxuj/beyond_oasis_genesis_manual.pdf
    • https://uploads.strikinglycdn.com/files/42a67d29-b386-4f82-92b6-2aa5be26194b/zatuvof.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_off0000e7a7.bin
fc6f975919c6f703f297288e9191ae0a432b5d9b474cc9a5a884a3fe97d683ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A7 5900 bytes
font_01_sfnt_off0000fbc2.bin
7e5e1c53c2913a2f458013d0653dea8c56e307d6ab3ae6413589544f774e8b8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC2 10776 bytes

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