Malicious PDF — malware analysis report

Static analysis result for SHA-256 08d8fa1334fa2d44…

MALICIOUS

PDF

78.8 KB Created: 2020-12-25 00:23:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18391d40fc01b7141999386dfc8a66a3 SHA-1: 581d4baa152895c05d0c196888c7af941c246b54 SHA-256: 08d8fa1334fa2d447cfdb1ccbdd829f213fc07b7d9487938d4f81cdc67a5bb32
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, including one pointing to 'traffking.ru', which is likely a malicious redirection or phishing site. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to game search engines or distribute malware. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the presence of external links and the ML classification strongly suggest a phishing or malware distribution attempt.

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://traffking.ru/strik?utm_term=red+velvet+cake+recipe+with+buttermilk+and+vinegar
    • https://cdn-cms.f-static.net/uploads/4402717/normal_5fa9d32d64ba8.pdf
    • https://cdn-cms.f-static.net/uploads/4454041/normal_5fa02856dc9a8.pdf
    • https://garegijewavib.weebly.com/uploads/1/3/4/3/134389285/6408060.pdf
    • https://cdn-cms.f-static.net/uploads/4369496/normal_5f94c9ee1bc5b.pdf
    • https://static.s123-cdn-static.com/uploads/4472788/normal_5fc7b1ebc1954.pdf
    • https://cdn.sqhk.co/tudakesovif/SqXTji9/maki_favorite_social_networks_in_one_tiny_application.pdf
    • https://static.s123-cdn-static.com/uploads/4415530/normal_5fdf2fdb4775e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/gogunabones/36981890501.pdf
    • https://uploads.strikinglycdn.com/files/ef331ead-b8b0-4385-b290-b97d5585ca32/15714792625.pdf
    • https://s3.amazonaws.com/gasodamuza/90700009072.pdf
    • https://s3.amazonaws.com/wutisigila/laxevakos.pdf
    • https://s3.amazonaws.com/xonobijikivo/fuvokalovamukulafe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea1d.bin
64eb24c6328fcd4c1461b0043814acb4c31c1108537d2462c6265db77b5eee60
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1D 5444 bytes
font_01_sfnt_off0000fc89.bin
4d2f4867e4c6a884c67bf7b8e2ba8a5ae292126a6894c149a6aa10f80c0e4f6f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC89 10416 bytes
font_02_sfnt_off00012035.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x12035 4324 bytes