Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0d24c3ea988f57d…

MALICIOUS

PDF

77.8 KB Created: 2021-03-18 08:51:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 617ba4c7752a0ec330f95ec839226340 SHA-1: 73013eac9bacbd6823c71e21b35f75c27f74bbf6 SHA-256: f0d24c3ea988f57d1dc43c80a261a80b83a1d83ad1aaa4fbc0283ab91420e4dc
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which are hosted on disposable domains or link farms, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier strongly suggest this is a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure itself is designed to facilitate the distribution of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://fokemale.ru/strik?utm_term=crimenes+de+la+calle+morgue+personajes+principales PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4471081/normal_5ff684cf466f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457563/normal_5ff4b62d01714.pdfIn PDF document text
    • http://dofukatejipoz.66ghz.com/lagu_stay_with_me_victon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418175/normal_5fec4c8d436e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486045/normal_5fc5f15567d8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486563/normal_603e48a3404f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477156/normal_603d529643d1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453906/normal_60478eb4bd3d1.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/4c5310e0-0f36-431f-bf1c-8d1ccd07d549/xelisigexaki.pdfIn PDF document text
    • http://mijikabetabup.rf.gd/magugilabitej.pdfIn PDF document text
    • https://ecf8b3bd-8201-449f-a39c-156acd88681e.filesusr.com/ugd/97634b_b031beffd0014628b6a2e73e4b60a4ad.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8aa9fafe-bc2c-467b-bb8e-285f401b5776/lawn_boy_gold_series_parts_diagram.pdfIn PDF document text
    • https://b133b025-67d1-4190-9e53-fbb99503dec2.filesusr.com/ugd/caf13f_32812e84cb3c4a16ac253310d30c7193.pdf?index=trueIn PDF document text
    • https://46fb9a51-9e16-4ad8-811e-2f7ed01702f7.filesusr.com/ugd/53363c_d349a70490204bdba44e6b301465fc19.pdf?index=trueIn PDF document text
    • https://5c126656-fc4f-473b-8c99-11744d2e1b96.filesusr.com/ugd/abd8ec_46d98a59ec7146f589326a82d4db8b63.pdf?index=trueIn PDF document text
    • http://warodisomadux.epizy.com/alexandrova_technika.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15177938-eebc-4d5e-8a95-2818e68e1793/3649753950.pdfIn PDF document text
    • http://migogitutid.rf.gd/atomic_blonde_movie_filmyzilla.pdfIn PDF document text
    • https://5a6df620-610b-4d6f-8f1b-71e936bb70bc.filesusr.com/ugd/1f5cef_ee90998abfd14e2185d3a601d52d1783.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fea95c4-9de9-4c1a-8bf6-ec8a9012c78c/xaxibosoxogexogatarag.pdfIn PDF document text
    • https://451b78f8-089e-4d4d-bc4b-60abb621f7e6.filesusr.com/ugd/7ef0dc_46f43c5a0ec64ed0814aa05c30e1ee7b.pdf?index=trueIn PDF document text
    • https://981168d4-05fc-44b6-871d-73371d7e8cf1.filesusr.com/ugd/87d215_485d110c6cf34ee09bc594ae27c1f748.pdf?index=trueIn 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_off0000ef83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF83 5372 bytes
SHA-256: d7b89aad6a6541995b719008d30178b3c0c5a83aeaac52ea7915020238848baf
font_01_sfnt_off000101b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B1 11756 bytes
SHA-256: ff27a7156660afe549fc0098140a92900a1de29da481b8f17700ba595172b146