Malicious PDF — malware analysis report

Static analysis result for SHA-256 a39c68f238ea534e…

MALICIOUS

PDF

73.0 KB Created: 2021-01-09 16:59:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 484ec210382977ec0446ff2fd79b9edc SHA-1: 7ab05b0d7db997e3d8aa2e5e4698a98f6ecfc710 SHA-256: a39c68f238ea534eaffa12184a0b22e23f56b8c27aea2e3454f9ca48d0bed347
156 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including a critical finding for a large number of external links, suggesting a link farm or phishing attempt. The ML classifier and ClamAV also strongly indicated maliciousness. The embedded URLs, particularly 'trafftec.ru', are likely part of the malicious infrastructure used to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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=alabama+vehicle+bill+of+sale PDF link annotation
    • https://kepijiloxa.weebly.com/uploads/1/3/4/1/134108658/dcc559d8.pdfIn PDF document text
    • https://cdn.sqhk.co/zubuwebofe/PMijhc6/23785449883.pdfIn PDF document text
    • https://ruwatija.weebly.com/uploads/1/3/4/8/134846771/073f96081c2278.pdfIn PDF document text
    • https://cdn.sqhk.co/sesijisova/ieheFjd/artillery_shell_identification_ww1.pdfIn PDF document text
    • https://dirututusobed.weebly.com/uploads/1/3/5/3/135347210/0ccd08e8ccc.pdfIn PDF document text
    • https://cdn.sqhk.co/xobanozizesa/B2XhirN/wafifoduzemujok.pdfIn PDF document text
    • https://foziletixe.weebly.com/uploads/1/3/4/8/134868526/62fc156.pdfIn PDF document text
    • https://cdn.sqhk.co/jekurona/iKOCTib/100_best_love_song_70_80_90.pdfIn PDF document text
    • https://negogepif.weebly.com/uploads/1/3/0/7/130775604/2693855.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/59291222710.pdfIn PDF document text
    • https://s3.amazonaws.com/kewuxejikiwe/indian_constitution_article_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/japulilasamisukik.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/89338646018.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/97767067932.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE166 5212 bytes
SHA-256: bec3bdf7fe49e0655dc6d7dedbb92cc672bcff1efa9b742ab487baa60fdd0d4c
font_01_sfnt_off0000f30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30F 10488 bytes
SHA-256: c4acd63d93cbe82e90d2ff5331215e83f33460fe96b1e92dab3561e4f4c5eb8b

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