Malicious PDF — malware analysis report

Static analysis result for SHA-256 c82ce2f9e878ccaf…

MALICIOUS

PDF

71.6 KB Created: 2021-02-28 07:11:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d68234e9b901a62df243ba2259dff10 SHA-1: 70be20a4e4831cd3518b2df0e35e4dbdaa64fd73 SHA-256: c82ce2f9e878ccaf18aae7c036c73935269c170e3a1b24a0a12a3354376df170
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or distribution mechanism. One of the primary external links points to a URL that appears to be a lure for a worksheet, likely intended to disguise malicious activity. While no scripts were explicitly extracted, the PDF structure and numerous external links indicate a potential for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/aws?utm_term=perimeter+of+polygons+worksheet+grade+6
    • https://static.s123-cdn-static.com/uploads/4380214/normal_5fee85109702a.pdf
    • http://flymoney.net/dyson_dc25_animal_filters3s50s.pdf
    • https://cdn-cms.f-static.net/uploads/4498842/normal_6010a9902b2e6.pdf
    • https://cdn-cms.f-static.net/uploads/4481988/normal_6020bc67b8b9f.pdf
    • https://nunevebola.weebly.com/uploads/1/3/4/8/134846747/zokexek-tisip-ninoduv.pdf
    • https://guvikaki.weebly.com/uploads/1/3/4/5/134519546/757218e27.pdf
    • https://cdn-cms.f-static.net/uploads/4455659/normal_6026c1a052dd9.pdf
    • https://rurefisofe.weebly.com/uploads/1/3/5/3/135325463/toxejif-sesire-wivogazeronegob-simesezososimog.pdf
    • http://sebokuxaxugu.iblogger.org/formal_dress_code_day_wedding.pdf
    • https://static.s123-cdn-static.com/uploads/4473637/normal_6004a8cc608f5.pdf
    • https://tofeniva.weebly.com/uploads/1/3/4/6/134625175/pusoseduwipinuxeko.pdf
    • https://geridaradekod.weebly.com/uploads/1/3/1/4/131437552/taruwujigufo_milajozerusiga.pdf
    • https://katalajoguv.weebly.com/uploads/1/3/2/7/132740778/xegusoluniwur.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mivajale.rf.gd/discovery_objections_cheat_sheet_florida.pdf
    • http://lefamuredemupi.epizy.com/xukojel.pdf
    • http://vuvuvemalazot.epizy.com/generation_of_computer_programming_languages.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dab4.bin
bf1751520f7015d8b099733b1fe9853905d5363112397703c5361f975e1c73b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB4 5868 bytes
font_01_sfnt_off0000ee9f.bin
4707d3bdd39f4f4bfc67ec9a3802bfc9e6f37853f4d8d41bd7b7824c3a94ddd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9F 10200 bytes

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