Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a146ad3ce3515b9…

MALICIOUS

PDF

117.3 KB Created: 2021-04-03 10:39:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 337bc73544ec2e764b3c44e829250ca4 SHA-1: 242b791e548c8957a084cad2385a7e37dda3a57e SHA-256: 6a146ad3ce3515b9ec8d86d47bba253461c43ad18a64547f43be6bea7ab57efd
166 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to decrypt an archive, a common tactic to bypass gateway scanning. The embedded URLs, such as https://midufefew.ru/aws?utm_term=john+deere+455+steering+parts+diagram, are part of a link farm designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/aws?utm_term=john+deere+455+steering+parts+diagram
    • http://fufirajonitav.22web.org/applied_physics_sem_1.pdf
    • https://cdn.sqhk.co/nisisepolo/GjcXghA/dragon_hills_retreat.pdf
    • http://pirewarekow.mywebcommunity.org/96489934790.pdf
    • https://cdn-cms.f-static.net/uploads/4420592/normal_5fd2dbe80a86e.pdf
    • http://doxugivo.22web.org/cydia_tweak_to_apps_over_150mb.pdf
    • http://vosalax.22web.org/jobejenivez.pdf
    • https://cdn-cms.f-static.net/uploads/4383322/normal_6024b362141a0.pdf
    • https://cdn.sqhk.co/lipidupi/hgEPagj/peteponisuxebolowefan.pdf
    • https://cdn.sqhk.co/sevijeruba/ghaELjc/letenevukeraxuxupexuseju.pdf
    • http://gelokan.sportsontheweb.net/spelling_test_for_grade_7.pdf
    • http://nosotedidapozal.22web.org/48849507392.pdf
    • https://cdn.sqhk.co/burajugi/gurhdi2/desulojasufereverudifi.pdf
    • https://static.s123-cdn-static.com/uploads/4464068/normal_5fe2570e413e5.pdf
    • https://cdn.sqhk.co/nupozifulija/hhjezja/download_extreme_car_driving_simulator_mod_apk_revdl.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fefekug.rf.gd/59279169264.pdf
    • https://uploads.strikinglycdn.com/files/e3cf27e7-83e1-4ab8-b571-5e333e4565f6/56757926189.pdf
    • https://uploads.strikinglycdn.com/files/dc2dad58-3f68-4a99-a1eb-7ae3ce949885/wegebafibesevez.pdf
    • http://batezitiguduf.rf.gd/32795416504.pdf
    • https://uploads.strikinglycdn.com/files/73788e17-6599-4a7e-9f6f-74a0c29e6a40/vejofumejemom.pdf
    • https://uploads.strikinglycdn.com/files/b502e9a9-1491-4081-9f8b-8027c8f7066c/14335254335.pdf
    • http://sulorowanutabu.atwebpages.com/4_quart_crock_pot_dinner_recipes.pdf
    • http://soreras.epizy.com/58523040482.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017fc7.bin
3b6c3edccbbdf68622c80e44ac099bd4bffa00507f4f1bc839f0bdbf087aa810		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17FC7 3080 bytes
font_01_sfnt_off00018ad1.bin
e8af7d7890bd419aea68a51f16fe574035bcdc98523dd9c69b8f35efcec3db13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18AD1 5544 bytes
font_02_sfnt_off00019d83.bin
33fb3b2005cee4248d77dcdd618698ef280fef085795f28be001433634b68604		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19D83 13320 bytes

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