Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8de8233b808008a…

MALICIOUS

PDF

66.0 KB Created: 2020-11-13 18:45:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 021ee34ad99a72e4818448a78227afec SHA-1: 141ca0dffb649ae6f918e46ff2e539a2fbd97fbe SHA-256: d8de8233b808008a2fbd1f03662adabf2f561104b671f39ea5199fe8f7f38547
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The presence of external URIs and the ML classifier flagging it as malicious further support this. Although no scripts were explicitly extracted, the PDF structure and embedded links point towards an attempt to redirect users to potentially malicious or deceptive websites.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffine.ru/123?utm_term=cell+phone+lanyard+strap
    • https://weduxuvup.weebly.com/uploads/1/3/4/3/134308116/1693079.pdf
    • https://gubaxefu.weebly.com/uploads/1/3/4/5/134592394/2796ab02d4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/02aeeed3-bd38-4160-9ac5-7c3649926ece/zedodalepu.pdf
    • https://uploads.strikinglycdn.com/files/5ede3222-a6c0-4e1b-8932-f99d603563dc/modern_legal_drafting_a_guide_to_using_clearer_language.pdf
    • https://uploads.strikinglycdn.com/files/932e3e48-794d-48fe-acc5-4e1c0f70bd45/xegevezolofobixisexube.pdf
    • https://s3.amazonaws.com/zerejibixupav/heat_and_mass_transfer_yunus_a_cengel_5th.pdf
    • https://uploads.strikinglycdn.com/files/24dfb086-24dd-4ba5-bc20-879912b9f61b/rukatidoki.pdf
    • https://uploads.strikinglycdn.com/files/e54c2754-595e-4792-891c-7bdd13801a53/43153268259.pdf
    • https://uploads.strikinglycdn.com/files/2b8682b2-55e8-4e51-a695-c3dc53d20327/mubabumuwudadamibu.pdf
    • https://uploads.strikinglycdn.com/files/b709b795-5fc3-4cc9-8c8e-2b869a9f1d24/carriage_house_cockapoos_goldendoodles_reviews.pdf
    • https://uploads.strikinglycdn.com/files/9a544de6-5e11-401f-974d-6dc7e2a8b365/33920130082.pdf
    • https://s3.amazonaws.com/retisovojor/grupo_tlaloc_danza_azteca.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_off0000c7ff.bin
221e43488461b476767939bce5c7892f2fede85ecfe97583a2d421836c0a891a
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FF 5052 bytes
font_01_sfnt_off0000d926.bin
13c391457d1c3fdeb74a258f9574f6ac99231f02582c3fdcc45f066d6016761a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD926 10032 bytes