Malicious PDF — malware analysis report

Static analysis result for SHA-256 805b9472ce1081cc…

MALICIOUS

PDF

63.0 KB Created: 2020-11-23 14:55:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8dd484c57b73c8a0b157344151912eef SHA-1: 394b4567e93178ef8fc54b0adf2fde3df74ad3c4 SHA-256: 805b9472ce1081cc7110dcfc34b662e24c8a3a6ba0d1f1ddca63874dffb61d70
156 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malicious link farm. It contains numerous external links, with one notable URL pointing to 'trafficel.ru', suggesting a potential phishing or spamming campaign. The presence of a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic, points towards an attempt to manipulate search engine results or redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafficel.ru/strik?utm_term=pharmacology+case+study+workbook+answers
    • https://kovovovugatu.weebly.com/uploads/1/3/4/5/134599685/pofulujupuf_bevup_bumazakezug.pdf
    • https://cdn-cms.f-static.net/uploads/4424378/normal_5fb623c853b38.pdf
    • https://cdn-cms.f-static.net/uploads/4373527/normal_5fadc10b71e8e.pdf
    • https://mogezisatizate.weebly.com/uploads/1/3/0/7/130775403/6fc070d6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gedimuta/wakonulos.pdf
    • https://uploads.strikinglycdn.com/files/ca1e0bfa-0287-44ee-9800-84dbf4ac13e2/death_in_the_clouds.pdf
    • https://uploads.strikinglycdn.com/files/69e83a31-112c-4a7b-b299-3b0ae6175650/riludivejuzunopaxizo.pdf
    • https://uploads.strikinglycdn.com/files/a6a73377-4220-4af1-8ded-51174a3f27e0/beau_pere_1981_movie_300mb.pdf
    • https://s3.amazonaws.com/biwubeleba/41145158805.pdf
    • https://s3.amazonaws.com/fasanag/86304412080.pdf
    • https://s3.amazonaws.com/wovisak/free_autocad_2007_software_with_crack.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_off0000b8f7.bin
2273f62d9cbae975a4a352bf4803636df98526f656f2325bf4f99fd21a7448ca
pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F7 5752 bytes
font_01_sfnt_off0000cc78.bin
17dff7cbcca911332f832419cabb087b47ab4bf3d8214f195ae91c9f85a80fa1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC78 10252 bytes