Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e35f1766f6ed97…

MALICIOUS

PDF

75.9 KB Created: 2020-11-18 19:43:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd41b040d30d1775c3b2f54f5b25167d SHA-1: d792520c25deaae851aa96bd3377cb3ab998328e SHA-256: f8e35f1766f6ed9756a84c46d1c1b8a50a22b6fab3b49c0076665d0fa984f666
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. One of the primary URLs, 'https://traffnew.ru/strik?utm_term=exemple+d+une+dissertation', is suspicious and likely leads to a malicious site. The document body, though heavily obfuscated, suggests a lure related to academic work ('Exemple d une dissertation'). The presence of embedded JavaScript and the overall structure strongly indicate a phishing or malware distribution attempt.

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://traffnew.ru/strik?utm_term=exemple+d+une+dissertation
    • https://cdn-cms.f-static.net/uploads/4370087/normal_5f8a4c2e97109.pdf
    • https://cdn-cms.f-static.net/uploads/4366321/normal_5f8df0d7c50c6.pdf
    • https://rokufekajo.weebly.com/uploads/1/3/0/8/130814342/96aa10dd9e4.pdf
    • https://cdn-cms.f-static.net/uploads/4421969/normal_5f9b7010e33dd.pdf
    • https://cdn-cms.f-static.net/uploads/4387712/normal_5f94d2f64da31.pdf
    • https://cdn-cms.f-static.net/uploads/4480899/normal_5fb45d6614292.pdf
    • https://cdn-cms.f-static.net/uploads/4408595/normal_5f95d32e2e864.pdf
    • https://cdn-cms.f-static.net/uploads/4368741/normal_5f87fd88d43a3.pdf
    • https://popilezofale.weebly.com/uploads/1/3/1/1/131164236/bupubebuwoj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/memul/wusomuj.pdf
    • https://s3.amazonaws.com/lanubili/sebastian_telfair_net_worth.pdf
    • https://s3.amazonaws.com/mupukesunobaga/congruent_polygons_corresponding_angles.pdf
    • https://s3.amazonaws.com/nijudow/goxewupidisog.pdf
    • https://uploads.strikinglycdn.com/files/413c29e3-4ad3-42b3-994c-b976c5101afc/15178542258.pdf
    • https://s3.amazonaws.com/titugome/samsung_washer_wa50m7450aw_manual.pdf
    • https://s3.amazonaws.com/tagorarib/coc_gem_hack_no_verification.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_off0000e8e1.bin
995fdc7885430dc59e8760c4cab77266de29b926e5c12757742b56e448ef33ba
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E1 5132 bytes
font_01_sfnt_off0000fa42.bin
613c9a140b1c854d006fb0c0a0e04750cf92ef68d3210d90730efed607369646
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA42 12412 bytes