Malicious PDF — malware analysis report

Static analysis result for SHA-256 67cdf0deb9b007f3…

MALICIOUS

PDF

65.3 KB Created: 2021-01-23 09:23:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b2cf95cc23379099b3a0202c95f5bdc9 SHA-1: c1dbca03e6b988cf9221b40d6825e04d25575984 SHA-256: 67cdf0deb9b007f37d2a787eebd4a9bb8512a3e8723fda8a9c672794c2e1e982
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafffi.ru/123?utm_term=funny+i+miss+u+quotes PDF link annotation
    • https://wulodegekejiwa.weebly.com/uploads/1/3/4/2/134266030/fadurak.pdfIn PDF document text
    • https://pugiputofal.weebly.com/uploads/1/3/4/7/134740318/zuluvokisusizaza.pdfIn PDF document text
    • https://zipuwuxa.weebly.com/uploads/1/3/4/3/134376087/9965900.pdfIn PDF document text
    • https://medivurufif.weebly.com/uploads/1/3/1/4/131407406/319941.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/3J7INhc/sawigesabupejobaxuf.pdfIn PDF document text
    • https://viduxetejogat.weebly.com/uploads/1/3/4/6/134600114/wunigigowipuga.pdfIn PDF document text
    • https://worojipe.weebly.com/uploads/1/3/1/3/131382243/4006084.pdfIn PDF document text
    • https://cdn.sqhk.co/velabolo/slqja4Y/mystery_wheel_of_pizza_challenge_sis_vs_bro.pdfIn PDF document text
    • https://savaxibinis.weebly.com/uploads/1/3/3/9/133997587/9099599.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/coP8ANL/shelters_near_me.pdfIn PDF document text
    • https://gilemana.weebly.com/uploads/1/3/5/3/135319463/nupazidubotatusib.pdfIn PDF document text
    • https://jolibudowuw.weebly.com/uploads/1/3/4/5/134596284/4148606.pdfIn PDF document text
    • https://nipixajivoru.weebly.com/uploads/1/3/1/4/131436983/8951161.pdfIn PDF document text
    • https://tasoxagizuj.weebly.com/uploads/1/3/4/7/134734804/kidopawoxiposo_gogevaxugix_wedawerox.pdfIn PDF document text
    • https://cdn.sqhk.co/jemajujo/ijzUIhj/vokaji.pdfIn PDF document text
    • https://deremufirig.weebly.com/uploads/1/3/4/8/134854029/bovidigox.pdfIn PDF document text
    • https://zofekumu.weebly.com/uploads/1/3/4/7/134741387/9946522.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fotopokidag.epizy.com/battleship_full_movie_filmyzilla.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_off0000c82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82D 4676 bytes
SHA-256: c081cd5034cf3a2d6c4b8b89491597e9823a7253ff7356c5d10f02d4303593e9
font_01_sfnt_off0000d817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD817 9332 bytes
SHA-256: 63682b72539bfa2e80592f4ffc58f5b66dfd25cb2307270e6de775dc592ab250

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