Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b9d961f6a3aef8f…

MALICIOUS

PDF

75.7 KB Created: 2021-03-27 17:52:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5b77f27f4c4c763d9bbc34e119183a5 SHA-1: 9c7d489502ce603f14f3e4e3091682fcef88d472 SHA-256: 2b9d961f6a3aef8f842ce212f119393619c2677974d39a7e8383cbe905deb3bf
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting. The embedded URL points to a suspicious domain, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URI are indicative of malicious intent, likely to redirect the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://mezovuduw.ru/wix?keyword=john+burkowski+apush+website.pdf
    • https://cdn.sqhk.co/kukisigafumi/gi5fngc/4724521916.pdf
    • http://jotijitod.66ghz.com/85988126752.pdf
    • https://cdn-cms.f-static.net/uploads/4423154/normal_60366044d8791.pdf
    • https://static.s123-cdn-static.com/uploads/4456676/normal_5fdd7e5d9f86a.pdf
    • https://cdn.sqhk.co/kokojisip/F8Mgigg/car_crash_simulator_unblocked.pdf
    • http://fevalugumaj.22web.org/20347349200.pdf
    • https://cdn-cms.f-static.net/uploads/4450257/normal_60535e1b137c6.pdf
    • https://cdn.sqhk.co/wogefosa/ihidihx/snapseed_photo_editor_background.pdf
    • https://static.s123-cdn-static.com/uploads/4485308/normal_5fedf4aa4eeab.pdf
    • https://cdn.sqhk.co/daxerarugak/5idggja/tetegalexobotodage.pdf
    • https://cdn.sqhk.co/dewufidabo/wdEvbih/guns_rockets_and_atomic_explosions.pdf
    • https://static.s123-cdn-static.com/uploads/4391903/normal_5ffc4adc4f4c9.pdf
    • https://cdn-cms.f-static.net/uploads/4475719/normal_5fd929e089fda.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/b0dbd6a2-1d13-4fe3-bfe3-426894cf2bc9/giwowopijakubetifumu.pdf
    • http://zulanow.rf.gd/strona_bierna_angielski_wiczenia_do_druku.pdf
    • http://xumutopefar.rf.gd/set_it_up_movie_subtitles_english.pdf
    • https://uploads.strikinglycdn.com/files/155cef70-ef29-44ff-902e-17695c0c3d52/11721968177.pdf
    • http://dogirajuwuxo.epizy.com/complete_ielts_bands_6._5_7._5_answer_key.pdf
    • https://uploads.strikinglycdn.com/files/4992c5ce-f043-41eb-8aea-0a743dc54cd2/60814154296.pdf
    • http://runodeb.rf.gd/41076114753.pdf
    • http://jetetekeputesi.epizy.com/sabanuwavitagoxebeta.pdf
    • http://rowisumemosil.rf.gd/finding_percentages_of_numbers_worksheet_year_6.pdf
    • http://modedavap.epizy.com/gonobamolemivoj.pdf
    • https://uploads.strikinglycdn.com/files/3a9e9071-515d-4f5f-a88d-deb40cd99b54/90470910936.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_off0000dd57.bin
b0666495fe5a5b8055b5499e6b03cca78e6e3e0a867b804febca92ccc29c611c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD57 5296 bytes
font_01_sfnt_off0000ef5e.bin
b0ee905374a105f84107680550897087fae183fa80ae22627a328f273ef172e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5E 10484 bytes
font_02_sfnt_off00011306.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11306 4324 bytes

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