Malicious PDF — malware analysis report

Static analysis result for SHA-256 1152372bac2ba3fe…

MALICIOUS

PDF

69.0 KB Created: 2020-11-19 04:50:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fbbe9779d6205d56ba193b7202fe0217 SHA-1: d56d1a84b0447b65bae3e5c5777a1a44f1c3b197 SHA-256: 1152372bac2ba3feb43178a35bd380e06e89e28c7ba6a58c80aa493a6aa72783
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary links, 'https://trafftec.ru/123?utm_term=duke+nba+players+all+time', is suspicious. Another link, 'https://s3.amazonaws.com/xanebavifamopez/lovol.pdf', is also flagged as a potential entry point for further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/123?utm_term=duke+nba+players+all+time
    • https://cdn-cms.f-static.net/uploads/4377381/normal_5f8f4221ade4a.pdf
    • https://cdn-cms.f-static.net/uploads/4413583/normal_5fb2dd9456ffa.pdf
    • https://cdn-cms.f-static.net/uploads/4367310/normal_5f874b6eb3105.pdf
    • https://tijogarukaro.weebly.com/uploads/1/3/4/7/134710746/0d556603faae0b.pdf
    • https://xesapexoxes.weebly.com/uploads/1/3/4/6/134633169/datilofowage.pdf
    • https://vixeroniwemeful.weebly.com/uploads/1/3/0/7/130740086/wamepenekazilu.pdf
    • https://furureseseruwa.weebly.com/uploads/1/3/4/4/134481841/4646599.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xanebavifamopez/lovol.pdf
    • https://uploads.strikinglycdn.com/files/15efa9c1-a02d-462a-b2b0-bb1b48cc4100/nilobiwofegolufuwi.pdf
    • https://uploads.strikinglycdn.com/files/0373bbb1-dee4-4032-8262-aee7878e2d05/manevo.pdf
    • https://uploads.strikinglycdn.com/files/5286ea02-0ff1-436c-9e9a-292aad6e2603/zaxalawugotefen.pdf
    • https://uploads.strikinglycdn.com/files/ff9316b4-da98-40aa-a6c6-796f6adc3224/ther_ex_notes_clinical_pocket_guide.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_off0000d374.bin
c19105176e93ef12bbcfe97cdfb5e3e37d590fc9d8518d0a264eb182ff844d4b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD374 5268 bytes
font_01_sfnt_off0000e558.bin
c1e857c0e8192de5eb0c6dd4cac207cc842758c25077283dfd0d1d8ecf8c543f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE558 10072 bytes