Malicious PDF — malware analysis report

Static analysis result for SHA-256 df3ae0c39b20c3ea…

MALICIOUS

PDF

70.7 KB Created: 2021-03-22 02:59:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 90993b1b28ecb512963aeb3d755936f7 SHA-1: d3172cf90e3743055e2bc10fa16858250dda3fab SHA-256: df3ae0c39b20c3ea683695ed060e4c60264a3973dc129e3f140d03dbdbce47c6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF document flagged by ClamAV as a phishing trojan. It contains an embedded URL pointing to a suspicious domain, which is likely used to host malicious content or redirect users to a phishing site. The PDF's structure and embedded URI suggest it's part of a link farm designed to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/strik?utm_term=ruger+lc9+9mm+9-round+extended+factory+magazine PDF link annotation
    • http://nukapag.getenjoyment.net/lovelapug.pdfIn PDF document text
    • http://nawemofukewo.medianewsonline.com/building_planning_and_drawing_book_download.pdfIn PDF document text
    • http://zajakewezu.iblogger.org/rubaribupebekewoluk.pdfIn PDF document text
    • http://goligofalu.medianewsonline.com/food_allergy_training.pdfIn PDF document text
    • http://dekiweragaf.mywebcommunity.org/74951937654.pdfIn PDF document text
    • http://mofemaruwek.sportsontheweb.net/82100132911.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_03043eb499234ded85fedd3a4266ea08.pdf?index=trueIn PDF document text
    • http://jomopizemiz.onlinewebshop.net/pimefewodu.pdfIn PDF document text
    • https://add83a7c-0e31-48b3-928b-061d82ba9144.filesusr.com/ugd/205ae4_0e48bdd7d12a4cbea87554c43cb48c64.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c02c9871-67c4-4d61-8a3b-f5ac1a8ae4fc/ridgid_air_compressor_hose.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd24ac5e-5823-4b46-b6b2-57b8123baec3/33852087662.pdfIn PDF document text
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_0e61edd2a8de445e9f53fae68a13b666.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/hypertensive_crisis_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/st_croix_hastings_pellet_stove_for_sale.pdfIn PDF document text
    • http://natadomemorad.epizy.com/87489690107.pdfIn PDF document text
    • http://tebaputazaxuva.myartsonline.com/windows_10_command_line_cheat_sheet.pdfIn PDF document text
    • http://wusudoxi.rf.gd/ranco_e2_error.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_off0000d421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD421 5576 bytes
SHA-256: 0890e45a14d272a248b0b1864111a2b520cfd6540af9f064b9b4e2d78bfeee34
font_01_sfnt_off0000e72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72D 11212 bytes
SHA-256: 9c80c6ede63e2df93329fb4166b435f8ea14318c37882ca064f45391403b3273

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