Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a4f0fdd03571502…

MALICIOUS

PDF

89.4 KB Created: 2021-04-07 22:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a35113809ddfab593eea475e633d1389 SHA-1: 2698e3936b5118f8ee0c7af08524ca965a4b13eb SHA-256: 2a4f0fdd0357150209e8e8a597de667d387380aa7dac70fee170c3856e37ce99
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The primary malicious URL identified is https://xezojetit.ru/strik. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://xezojetit.ru/strik?utm_term=who+says+this+is+the+way+in+mandalorian PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4426828/normal_5fececc0354f1.pdfIn PDF document text
    • https://falojaba.weebly.com/uploads/1/3/0/7/130776150/9241911.pdfIn PDF document text
    • https://cdn.sqhk.co/posojuvapono/c9m3zkq/82862608058.pdfIn PDF document text
    • https://vawevoza.weebly.com/uploads/1/3/1/4/131482963/mogawe-sakeninakuletep-pejoluv-buxowetu.pdfIn PDF document text
    • http://hamlikjorettoop.ru/read_180_real_book_stage_bxuj5z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417408/normal_6038e93ebf375.pdfIn PDF document text
    • https://cdn.sqhk.co/tenotitur/kzEkyyf/vuzirenuresuvibaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388426/normal_5fd7dd9a08c59.pdfIn PDF document text
    • https://sexomimafu.weebly.com/uploads/1/3/4/3/134311134/vatoti_dixiteseka.pdfIn PDF document text
    • http://omynutural.space/bostitch_sb-_1664fn_manualr6fcs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417030/normal_5feb486e2ec51.pdfIn PDF document text
    • http://keep-travel.com/23384900921oi02u.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/dukavunivifa/hypothyroidism_ppt_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/260a289b-1d0d-487e-be04-f4ff08996462/sizabikolivuzoden.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71993152-e0d5-4c0e-b982-09b76ba75cce/27023537367.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/reported_concussions_in_the_nfl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f808b3c-fffe-4285-96d1-394afb3c0289/tapijigupixopuj.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/66272351055.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/how_to_translate_a_document_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bb808af-3777-41a3-9ec6-817f655b701a/dugowotiwafedone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7ccab71-6a19-49b1-8be8-68405300e048/ruzujavexomavoxur.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/lemebuzewe.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_off000111a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A3 5060 bytes
SHA-256: 295948c16897588fb7e06a432ca75ff91f7431ca5a15aa235f63eda6e6414dfd
font_01_sfnt_off000122af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AF 11536 bytes
SHA-256: 4f73e40e4ff3ddb645ac68c295674792a9f33dc744e01a4a8cb331a67666d4a4
font_02_sfnt_off000149e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149E1 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34