Malicious PDF — malware analysis report

Static analysis result for SHA-256 9582fa1469f02759…

MALICIOUS

PDF

91.0 KB Created: 2021-05-13 11:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 957ea773288a94a79684e86bad26628e SHA-1: 4b3c663dc4182de872a9ebd2832e00479d19f9f4 SHA-256: 9582fa1469f02759f31420f83e211d86ce72292d8bbc0604770f4d3ad3a2de6d
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document contains numerous external links, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'SE_REMOTE_SUPPORT_LURE' indicates the document's content likely instructs the user to install remote-support software, a common tactic for phishing or malware delivery. The presence of embedded JavaScript, though not fully detailed, suggests potential for further malicious actions like payload download or execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://gimoguvi.ru/strik?utm_term=bersa+thunder+380+hollow+point+ammo+for+sale
    • https://static.s123-cdn-static.com/uploads/4382781/normal_5fcc53ed04fca.pdf
    • https://cdn.sqhk.co/godereliku/gcjhshg/teachers_union_demands.pdf
    • https://vamalogobiw.weebly.com/uploads/1/3/4/6/134696595/4292751.pdf
    • https://cdn.sqhk.co/riwifesineji/ieRvJgh/weporiturefitajagavetiwer.pdf
    • http://biggymstoe.com/sorenostvr.pdf
    • http://santand-es.com/y3i2j.pdf
    • https://cdn-cms.f-static.net/uploads/4458837/normal_603448187f08e.pdf
    • https://cdn.sqhk.co/dabekojov/6hgtxhc/angular_2_templateurl_dynamic.pdf
    • https://wotuvinuvokotar.weebly.com/uploads/1/3/5/3/135330473/5a5a6fec.pdf
    • http://tevfikyuce.xyz/folovujirh0qq.pdf
    • https://static.s123-cdn-static.com/uploads/4421615/normal_5ff03d52ee6ea.pdf
    • https://gufovijer.weebly.com/uploads/1/3/5/3/135339237/devidalasowalufeges.pdf
    • https://mevemedetu.weebly.com/uploads/1/3/1/8/131871578/3979860.pdf
    • https://voduzivet.weebly.com/uploads/1/3/1/6/131607522/zajefotaro-kivat-fomusimudiwe.pdf
    • https://static.s123-cdn-static.com/uploads/4446030/normal_5fec7bf448da9.pdf
    • https://cdn-cms.f-static.net/uploads/4381095/normal_60174e980574f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jumedemimo/spongebob_theme_song_flute_sheet_music.pdf
    • https://uploads.strikinglycdn.com/files/ff221b33-7ab6-4975-a4f4-b33252f6b9bb/55755388491.pdf
    • https://uploads.strikinglycdn.com/files/b74c5be4-8eda-4947-8258-8fb0eafe82d4/how_to_build_a_concrete_shooting_bench.pdf
    • https://uploads.strikinglycdn.com/files/2d0af445-21bd-46d8-93be-2d39e4c5c289/lord_of_chaos_wheel_of_time_review.pdf
    • https://uploads.strikinglycdn.com/files/4f38b184-c00e-4dbb-9a3f-63cb06a8a67c/goflex_home_software_download.pdf
    • https://s3.amazonaws.com/gewisetug/wadunolitazisixefo.pdf
    • https://s3.amazonaws.com/xulepiwa/55513932529.pdf
    • https://uploads.strikinglycdn.com/files/978a2cdc-18da-4a14-90a3-ae4cc1923a11/80700673735.pdf
    • https://s3.amazonaws.com/piradi/28620251791.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_off00011de9.bin
1e5f2cdc5ae2f327248c8e3beeba85261f26af3f68c713c4ee210175be392eea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE9 5920 bytes
font_01_sfnt_off000131ee.bin
f221d5abbbbdcb145aabb8c3f882bc66ee58812aa4f63552e2f97c1379f1ba9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131EE 13504 bytes

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