Malicious PDF — malware analysis report

Static analysis result for SHA-256 971697e1b7f3afe4…

MALICIOUS

PDF

93.3 KB Created: 2021-01-06 07:11:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 3ff2c775caa52cbd0679f0985d0c0dda SHA-1: de87ca7ae9c80ec6bdbef8b1164946023c999b39 SHA-256: 971697e1b7f3afe49a1724289c87b02c600ad2d5a007fa6b7445177cb5243171
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://traffmen.ru/aws?utm_term=arc+welding+electrode+selection+guide'. This indicates an attempt to lure the user to a potentially harmful website. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious URL is sufficient evidence of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://traffmen.ru/aws?utm_term=arc+welding+electrode+selection+guide In PDF document text
    • https://static.s123-cdn-static.com/uploads/4366336/normal_5feed564bc40b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467612/normal_5fb6b2cf45eeb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459787/normal_5fecb9614e512.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/gogunabones/vmfa_531_grey_ghosts.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/gojijudugufujide.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/wokil.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/17651904575.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed91250c-311a-42a1-9f99-994dd71c0bf2/ap_stats_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/clcss_latest_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98869487-642f-4c09-8f9a-1f4c93dfd2d6/fefibulumixukuvegimox.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/desumede.pdfIn PDF document text
    • https://s3.amazonaws.com/kewuxejikiwe/link_to_stylesheet_html5.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12719 2900 bytes
SHA-256: 10a07fc969e6c8cf41398fcfefa625e426b29a45b33f3716d0886db1405c0d2a
font_01_sfnt_off0001315c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1315C 4976 bytes
SHA-256: cb48a3280298e340878d5a1db63986c4cab63ad52ebc5b2c4231578ea820fa43
font_02_sfnt_off0001426b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1426B 11000 bytes
SHA-256: 5dde90f51ad314584c8248aaa0d61a98e51c8cb7929742140f8035da525f6704

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