Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a972eddef76f36a…

MALICIOUS

PDF

62.8 KB Created: 2020-12-24 08:42:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 751abd1e9fef489455ffc32bd99f80d1 SHA-1: bd3cf3cb9c4319ebbeabc0caea61459cacac5ca2 SHA-256: 1a972eddef76f36a5612b3fb97c2f954546ed79526c106798aac8511ec76d2ed
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 PDF link farm. One of the embedded URLs, 'https://trafffe.ru/strik?utm_term=28+oz+diced+tomatoes+calories', is flagged as suspicious and likely leads to a phishing or malicious site. The ClamAV detection and ML classifier further support its malicious nature, suggesting it's a phishing or trojan 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://trafffe.ru/strik?utm_term=28+oz+diced+tomatoes+calories
    • https://ramipataxeki.weebly.com/uploads/1/3/4/4/134483057/nifafoguzuz_fosiribi_kuboxezeseganox_ronejiputasuz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sorogamat/84163518127.pdf
    • https://s3.amazonaws.com/fejififimaketo/43933428548.pdf
    • https://uploads.strikinglycdn.com/files/1f91ba2e-0d11-49a9-bf74-04bcb66e53c9/94427264054.pdf
    • https://uploads.strikinglycdn.com/files/cadf0ddf-d6e6-429b-91ac-26ee7af8ff15/wewafiruxu.pdf
    • https://s3.amazonaws.com/pukasojalu/daenerys_targaryen_art_wallpaper.pdf
    • https://s3.amazonaws.com/zesotat/52849177671.pdf
    • https://s3.amazonaws.com/vovuzize/62169942145.pdf
    • https://s3.amazonaws.com/pugomonapoxuxe/rutinaninojeluminexovuwi.pdf
    • https://uploads.strikinglycdn.com/files/915f5f94-4bb6-4a8e-bde3-b9cb49bc10f8/multiplication_nombres_dcimaux_cm2_exercices.pdf
    • https://uploads.strikinglycdn.com/files/0baa52ac-c9e2-4b5f-a1da-8c8b1d25b497/susatasupisanono.pdf
    • https://uploads.strikinglycdn.com/files/716d7135-f8b9-48b2-bfa5-c4749e9cf852/group_of_dogs_is_called_a.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_off0000af17.bin
5da189e5656bac97b976a4b3e963dc5eb492c130a669aac92c41b703783ce981
pdf-font-stream PDF embedded font (sfnt) at offset 0xAF17 5364 bytes
font_01_sfnt_off0000c136.bin
3c8c70e95e172d87f88249f6e98f5fcd1d779dd22b9512bb6276049fa774e71f
pdf-font-stream PDF embedded font (sfnt) at offset 0xC136 1940 bytes
font_02_sfnt_off0000ca6e.bin
49226a131a80ce765d0c06c35c33faeaed3b1b2bd2ad3ac931a2585b00242d31
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6E 10488 bytes