Malicious PDF — malware analysis report

Static analysis result for SHA-256 89d6f80a967dfd44…

MALICIOUS

PDF

81.9 KB Created: 2021-05-02 16:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8bd70c4060e4dec7dc559d2cef889f2f SHA-1: 22575fc96c082a893283c1dc09348b599f1cd4ad SHA-256: 89d6f80a967dfd44c9e995869ef981d85a55bdbc9ab882ac88a9a4916682d4f8
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO poisoning and phishing. The heuristic PDF_SEO_LINK_FARM indicates a large number of links designed to manipulate search engine results. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery through the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/strik?utm_term=the+entertainer+sheet+music+beginner
    • http://artemk.ru/cello_sight_reading_exercisesi15gn.pdf
    • https://tarezusubem.weebly.com/uploads/1/3/5/3/135386237/foropixe.pdf
    • http://sweetmeet.online/bedtime_stories_movie_australian_ratingz71c0.pdf
    • http://esmoney.site/fomebebovawur5tzma.pdf
    • https://cdn.sqhk.co/kadeposamo/chehajg/49910764318.pdf
    • https://kifesajisibak.weebly.com/uploads/1/3/4/8/134884742/4194662.pdf
    • http://dominis.xyz/jopefovulutabezetlih32.pdf
    • https://cdn.sqhk.co/xixewebirike/ia1hgsU/cookie_clicker_hacked_arcade_games.pdf
    • http://hairhome.moscow/hp_envy_4500_printer_ink_cartridge_replacementb56x0.pdf
    • https://cdn.sqhk.co/wibononuve/gBYJYhj/88159251445.pdf
    • https://cdn.sqhk.co/lebogomatoze/uhgjhjK/x-_wolf_mod_1._2._0.pdf
    • https://cdn.sqhk.co/tamoravuwera/heBnhjR/arcade_games_emulator.pdf
    • https://cdn.sqhk.co/madagijoj/2LJhdd7/best_free_online_courses_to_learn_spanish.pdf
    • https://cdn.sqhk.co/texekikevow/Cpaibic/putusonefiviru.pdf
    • https://rogapunuki.weebly.com/uploads/1/3/4/3/134375427/likuje-vabufur-nevabumadid.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/80660ec5-f606-415e-bb2b-5135f8078b59/describe_the_rainy_season_of_advancing_monsoon_season.pdf
    • http://rasunafosav.epizy.com/natujo.pdf
    • https://uploads.strikinglycdn.com/files/4054f736-d184-403f-a93d-69e852635820/troy-bilt_2700_psi_pressure_washer_175cc_manual.pdf
    • https://uploads.strikinglycdn.com/files/627f1502-8c1e-4f82-b3e7-54a6cacf9cd4/90432163873.pdf
    • http://lanosewidem.rf.gd/33096149833.pdf
    • https://uploads.strikinglycdn.com/files/d4da2886-0545-4f48-8c42-678f1aee59e9/pogifo.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_off00010254.bin
f3510bec90ac8fce6e649e47deb12ba9cd048cbbdca812ea318a093bcc98a6fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10254 5272 bytes
font_01_sfnt_off00011411.bin
183d309dc069ad436cf9f1528c4643ae96d339eaaa6834a7ad924a88c508edda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11411 11180 bytes

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