Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe08a4855a5acb4c…

MALICIOUS

PDF

84.1 KB Created: 2021-04-07 07:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 861bca128045b11cd5573eda713cfebc SHA-1: 3a1fc77b4af42555b99589d8a0ff23445913e335 SHA-256: fe08a4855a5acb4cfac9df8abb9a2a10e6a397ee0992e4a55745e699108bb3fe
226 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The PDF document contains a large number of external links, many pointing to disposable hosting, and is flagged as a link farm. It also includes a heuristic indicating a lure to install a browser extension or update. While no scripts were directly extracted, the presence of numerous external URLs and the 'browser extension installation lure' heuristic strongly suggest a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://dugedepap.ru/strik?utm_term=ncss+social+studies PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384639/normal_601afec85fdd5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408481/normal_5fc678b1e3bf3.pdfIn PDF document text
    • http://ketrovk.xyz/how_to_renew_pistol_permit_in_nydnv8z.pdfIn PDF document text
    • http://alcexpress3.xyz/22461641903lebba.pdfIn PDF document text
    • http://betmoy56.com/can_covid_cause_brain_fogjb71n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445866/normal_601ad45f6a439.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454436/normal_5ff21b1e8203a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414332/normal_5fd08a47ac9ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447647/normal_604ddfba0cde8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471945/normal_5fc69194eeb6b.pdfIn PDF document text
    • http://rollernefritmassage.xyz/batazekuvtsv3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460457/normal_602648d1e2ee5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424951/normal_603b058b89a42.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425235/normal_5fe42a93e2db9.pdfIn PDF document text
    • http://ulekschool.online/difference_entre_fe2_et_fe38hgen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530171/normal_5fdbdc4aaed94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419452/normal_604d8108cb5f5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/16198589793.pdfIn PDF document text
    • https://6b21c484-99f8-4e97-b77a-b77c054bfe5d.filesusr.com/ugd/f139d4_433fdd6472d14e9a87ae95e19f377488.pdf?index=trueIn PDF document text
    • https://1a6c606f-1efd-495f-9370-57f425d809fd.filesusr.com/ugd/1be480_52538851fd4a42e28360165d91fd2abe.pdf?index=trueIn PDF document text
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_4276e9c013924412ac3826bacea82236.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/subopukomanaw/tesadebijosewiwukufubula.pdfIn PDF document text
    • https://b7d3a0ae-8059-487b-8826-088776693174.filesusr.com/ugd/8d23e4_bbf880be68384154a5a688a6014dbd73.pdf?index=trueIn PDF document text
    • https://13cfbe10-32e4-4d7a-9072-8dbd3280e6b8.filesusr.com/ugd/994e9e_613be76015f94a6b9c18207849c599ca.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/suwikuji.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_off00010ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA8 4804 bytes
SHA-256: 119c818c2a10cdbf78f95e8cd9baa3c7f275f6ed28e93a358adefbb2b95ce8fc
font_01_sfnt_off00011d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D13 11152 bytes
SHA-256: 8749889fe1cd0598ff2d77d5532ae65681dda8148511eafe78fb322bd47a9303

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