Malicious PDF — malware analysis report

Static analysis result for SHA-256 7425cf44165f5474…

MALICIOUS

PDF

89.9 KB Created: 2021-03-05 02:59:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 270ae5aabba23adaf21d48009a5c194b SHA-1: 8884abee9cb6d89af73fb0f1df58c59d2986d89c SHA-256: 7425cf44165f5474a3330b0e4ef5ff7a4f9992234330feb4f9e97017b05de4ad
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains and Weebly-hosted files, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these linked documents. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

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://mezovuduw.ru/award?keyword=fs+i6+receiver PDF link annotation
    • https://jizexukufi.weebly.com/uploads/1/3/4/1/134109318/9798236.pdfIn PDF document text
    • https://fukusegoboviv.weebly.com/uploads/1/3/1/8/131856281/937641390a53f3.pdfIn PDF document text
    • https://sivekilupikuma.weebly.com/uploads/1/3/4/4/134491743/budafakuf-wipagutido-jovet-jarufutob.pdfIn PDF document text
    • https://rujavuxubigiwak.weebly.com/uploads/1/3/4/3/134331492/kaboka-wajetiviloz-rubunomav-lotine.pdfIn PDF document text
    • https://jawoxaze.weebly.com/uploads/1/3/0/9/130968973/zenodirim_mawasuvogalapa_wukimimiv.pdfIn PDF document text
    • https://cdn.sqhk.co/paxepilekot/e2icuBk/54477265164.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/WL3oloc/hockey_monkey_irvine_california.pdfIn PDF document text
    • https://tamidotojo.weebly.com/uploads/1/3/1/8/131858916/07b37271aac90c7.pdfIn PDF document text
    • https://xadigepuve.weebly.com/uploads/1/3/1/4/131454317/3382053.pdfIn PDF document text
    • https://sebumowuvuxeluz.weebly.com/uploads/1/3/5/9/135962316/811697.pdfIn PDF document text
    • https://zekasujiminog.weebly.com/uploads/1/3/4/3/134366003/vepewodopobor.pdfIn PDF document text
    • https://xidumalebuwun.weebly.com/uploads/1/3/4/8/134894794/rixogigi_zapokibikizidel_bagizotenuke.pdfIn PDF document text
    • https://tiseworadew.weebly.com/uploads/1/3/5/3/135317060/dce2e656a.pdfIn PDF document text
    • https://dopakuxapat.weebly.com/uploads/1/3/4/8/134895633/berakosevika.pdfIn PDF document text
    • https://zinegekoxemajaj.weebly.com/uploads/1/3/4/7/134767253/fufam-jejomozavi-keperubuzawu-jujiwefulix.pdfIn PDF document text
    • https://cdn.sqhk.co/ropikenetu/idMIgcJ/como_jogar_sword_of_chaos_no_pc.pdfIn PDF document text
    • https://foxakiletomuxo.weebly.com/uploads/1/3/4/0/134012751/xepezutixak.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/3418ac30-3c6f-46a1-99cd-0376d0f99a6d/why_is_my_amazon_tv_remote_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0100964f-f08f-4620-a4f4-05b443151f2f/how_to_get_job_at_burger_king.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67b4eb61-b464-4dd7-bc6d-98b22ff412f1/97752449259.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57ea1e72-146a-417c-839a-16f704d6a677/10668330352.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4012ea30-d251-4786-8549-59ef17a411aa/dispute_resolution_methods.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_off00011d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D12 4720 bytes
SHA-256: 0db5b0776076faa41a9fd3809a508ec94920a19f243601b337f76f3fd8c70f37
font_01_sfnt_off00012d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D32 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off000135bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135BF 10696 bytes
SHA-256: 753120832b7c3b47df708717404326b237654f49108a25fff7145b50b15f4510