Malicious PDF — malware analysis report

Static analysis result for SHA-256 17ba50179015a71b…

MALICIOUS

PDF

92.0 KB Created: 2021-05-29 20:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ba08ea108546828a96cc9cad8f43aabc SHA-1: 4719018140adce73121c6e3cc144713dbb67d46d SHA-256: 17ba50179015a71bce77c7e2a54f47bbd7b7d3de34e22a36bd7b4b33f1bde3e8
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, indicating a link farm designed to distribute or redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=diablo+2+lod+no+cd+patch+1.13+download PDF link annotation
    • https://lazezareb.weebly.com/uploads/1/3/4/3/134311903/gemen-kudebij.pdfIn PDF document text
    • https://kazagito.weebly.com/uploads/1/3/4/6/134665665/f143c4fc770a01.pdfIn PDF document text
    • https://navowilupaxit.weebly.com/uploads/1/3/1/3/131381067/mofonij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499283/normal_6038ef576cc26.pdfIn PDF document text
    • https://wajufavex.weebly.com/uploads/1/3/4/5/134587400/sisofetatexepu_gokifuruzadeje_junukel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473903/normal_5ff400ad2cbbf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475389/normal_5ff3f3ee5e972.pdfIn PDF document text
    • https://lenalavawin.weebly.com/uploads/1/3/4/7/134732275/a0d40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481065/normal_5fd9c12daf7fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413373/normal_5ff1496b186b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469370/normal_60119a0d07344.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473902/normal_5fea3473aad4f.pdfIn PDF document text
    • https://norakefepasuki.weebly.com/uploads/1/3/1/3/131382134/3516871.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a10bc9c0-ed3d-4066-b114-b4911273152d/vizio_40_5.1_sound_bar_system_sb4051-c0.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8607715-3a06-4183-90e0-02f861db8255/26629829265.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf15e08e-f395-473d-a519-999111102555/2008_dodge_avenger_power_steering_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c83f817-3c82-4502-83e8-bd158999491e/51375151234.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83fc84ee-ffb0-4736-ae5b-e98136018a74/56233032458.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d2f801b-912f-4051-8e54-f072fc192d5e/how_to_start_orbit_sprinkler_system.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_off00011412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11412 5500 bytes
SHA-256: eef546b5c52780203d2270240e5cc6a1d6c08cc901df4ec482cd1c5f3b236b13
font_01_sfnt_off000126e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E2 21576 bytes
SHA-256: 889fa9f4736f6ac7efd688ed115b1b82d80832a2a4663d0a6a7c0759d9a94339