Malicious PDF — malware analysis report

Static analysis result for SHA-256 e160c97e40056352…

MALICIOUS

PDF

68.4 KB Created: 2020-12-01 23:01:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca6eb2e81d535e3bc41b7e54683b7319 SHA-1: d67745e1cf6499279b8689225461d00ed04b8ebf SHA-256: e160c97e40056352b2b9c6311e865e45f23aa801726e729fbc76a5ca11039031
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. The primary URL, 'https://traffking.ru/123?utm_term=brita+filter+instructions+soak', suggests a phishing or SEO-lure attempt. While no scripts were directly extracted, the presence of PDF_SEO_LINK_FARM and PDF_URI heuristics, along with the ML classifier and ClamAV detection, strongly indicates malicious intent, likely related to phishing or malware distribution.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffking.ru/123?utm_term=brita+filter+instructions+soak
    • https://zuxafeduf.weebly.com/uploads/1/3/4/6/134626046/jokojaxibu.pdf
    • https://bufazori.weebly.com/uploads/1/3/4/3/134377245/21cbe4af1120.pdf
    • https://fujubonutebi.weebly.com/uploads/1/3/4/2/134266124/dagipufeviwuzim.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/degisapemifa/vemomumefulod.pdf
    • https://static1.squarespace.com/static/5fc07d836b97992eb55a0df7/t/5fc116525147b148045a5231/1606489682743/52982662993.pdf
    • https://s3.amazonaws.com/jedaxopopuko/68621283964.pdf
    • https://s3.amazonaws.com/povodijirig/64582740582.pdf
    • https://static1.squarespace.com/static/5fc0e7b740f1034a5ca8d025/t/5fc5119d5147b14804d30528/1606750622893/samsung_smt_h3262.pdf
    • https://s3.amazonaws.com/niporofez/travel_checklist_template_printable.pdf
    • https://s3.amazonaws.com/wumodukubaru/9547414724.pdf
    • https://s3.amazonaws.com/mokuwanibof/drive_by_daniel_h._pink.pdf
    • https://s3.amazonaws.com/fulosobezur/joposuruwasum.pdf
    • https://s3.amazonaws.com/jusuberu/durood_e_ibrahim_meaning.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_off0000cdea.bin
fb8d003d7b7cc2daabb90c15caa8495e23d10966445cc78080ae3afbcc898949
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDEA 4988 bytes
font_01_sfnt_off0000def4.bin
6648ee9174561ba91307886f9e0a4cd2c45a80311839cff2360af56207e178b9
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF4 11112 bytes