Malicious PDF — malware analysis report

Static analysis result for SHA-256 776f660c0a08bc8b…

MALICIOUS

PDF

73.9 KB Created: 2020-12-05 14:17:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 312625668aed06f84780251b2df75329 SHA-1: 1c162be811a454b6e419435f5cbb6676c3f0ca92 SHA-256: 776f660c0a08bc8b25474452cf64d8e4f5f7db4f37382a826ab298223b19b04a
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, with the primary heuristic identifying it as a link farm. One of the embedded URLs, 'https://traffine.ru/strik?utm_term=crash+by+jerry+spinelli+questions+and+answers', is flagged as suspicious. The ClamAV detection and ML classifier further indicate malicious intent, likely related to phishing or malware delivery through these links.

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://traffine.ru/strik?utm_term=crash+by+jerry+spinelli+questions+and+answers
    • https://misutinulil.weebly.com/uploads/1/3/1/4/131407711/fozapab_luvad_tigorukifakatu.pdf
    • https://mivodijabid.weebly.com/uploads/1/3/4/7/134732330/63dd0d893.pdf
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/safado-fodidunixoso.pdf
    • https://gatixitawenubik.weebly.com/uploads/1/3/4/6/134643062/xagefe.pdf
    • https://cdn-cms.f-static.net/uploads/4476453/normal_5fb35c6bac4ff.pdf
    • https://kizekusoviwo.weebly.com/uploads/1/3/1/4/131453028/1b180e4e982.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a64a454e-4bf9-4ead-a3e3-69ca2ee716d4/66188148231.pdf
    • https://uploads.strikinglycdn.com/files/91657fd5-5cc5-43fb-9ee2-5084b782b3b0/zefigufiwezaxujominedoku.pdf
    • https://static1.squarespace.com/static/5fc110906609fd0ee7923de0/t/5fc36a9708845d0924f55324/1606642327985/65071261578.pdf
    • https://s3.amazonaws.com/voropa/convertir_un_en_ingles_a_espaol.pdf
    • https://s3.amazonaws.com/werowibovezoje/kasolelivozegizozogu.pdf
    • https://uploads.strikinglycdn.com/files/3dca4f2a-2b6a-49c4-af0b-5d64ce663b25/bufuleferifulovovelil.pdf
    • https://uploads.strikinglycdn.com/files/e8d3bcec-320f-402d-b051-629af92d8406/bemosuko.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_off0000e113.bin
3a0168ed10a44c677d4aa094005858c34326cd18c55b5fbce6a435dec94ba118
pdf-font-stream PDF embedded font (sfnt) at offset 0xE113 5488 bytes
font_01_sfnt_off0000f3be.bin
415d137ea11388484d104dbb6efee1a252c6f864098af842819d3af554a93a8e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BE 11380 bytes