Malicious PDF — malware analysis report

Static analysis result for SHA-256 839bb51266787be1…

MALICIOUS

PDF

76.0 KB Created: 2021-03-28 05:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c57d0b53c1c77c6e1052fd0ce85c866 SHA-1: ab62859413b945c40a5b67e5295aef81f0ccbd3f SHA-256: 839bb51266787be19b4eb48775d3fb7345e19438cfcba8ebb8bdec21ae8f7f7e
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to a 'Porsche 928 gts service manual'. The presence of external URIs and the link farm heuristic indicate an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/wix?keyword=porsche+928+gts+service+manual
    • http://wusator.mygamesonline.org/free_asvab_study_guide_2020.pdf
    • http://mimisijuz.mypressonline.com/22032177867.pdf
    • https://static.s123-cdn-static.com/uploads/4380083/normal_5fcd3eefd5089.pdf
    • http://koxivesuvif.mypressonline.com/adjective_comparative_and_superlative_words_list.pdf
    • https://static.s123-cdn-static.com/uploads/4456369/normal_5fff5164bde34.pdf
    • https://cdn-cms.f-static.net/uploads/4492257/normal_6055cce87eaf7.pdf
    • http://nazhivy.net/7802683305115j4p.pdf
    • http://rezisekuvaz.mypressonline.com/mappa_di_alicante.pdf
    • http://buyervannakupitvsem.xyz/wezejumulofekuladugapj4efy.pdf
    • http://lemakomude.sportsontheweb.net/46745552247.pdf
    • http://leree4.club/mutants_and_masterminds_worlds_of_freedomscklk.pdf
    • https://cdn-cms.f-static.net/uploads/4443292/normal_60582ccf697cf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_9a965637ebc04307827e35d38ae89357.pdf?index=true
    • http://zaxuzut.atwebpages.com/11270775195.pdf
    • http://nabenejajoko.myartsonline.com/minununobufamidijegazeba.pdf
    • https://0ed7c29b-d5f2-4290-8b47-add6aa38300d.filesusr.com/ugd/32a223_0bb3dc79623b4d4387a5b5a05135e33b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e3c2febe-2596-4a7d-bb2f-4f935b3206f3/big_java_solutions_manual.pdf
    • http://zizenatoxu.myartsonline.com/ximekegak.pdf
    • https://uploads.strikinglycdn.com/files/c2ae1450-8d42-4934-ae4a-a4cb1cb0709b/what_wahl_clippers_do_barbers_use.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_off0000eb37.bin
766383762f31c829bc10a2b95722edffd3cbad456577fdf12401609c0d16717a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB37 5756 bytes
font_01_sfnt_off0000fea3.bin
d03497cb821e759532f46ad2add42d347b46605186b71d213e4bcbb4e2da884d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA3 10484 bytes

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