Malicious PDF — malware analysis report

Static analysis result for SHA-256 150e2cab4a58c043…

MALICIOUS

PDF

80.0 KB Created: 2021-02-12 15:54:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 0d4bb97e7363c2c7f7aee46652f8dc2c SHA-1: fc2ca416d0c0ebbf9df8820a7e22edde035b2d3c SHA-256: 150e2cab4a58c043f199f52f346b6c498ecee49a2fd37deb3447e701258c0fa9
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on disposable domains, with numerous external URIs pointing to potentially malicious content. The document body, though heavily obfuscated, contains references to wkhtmltopdf, suggesting it may be a generated PDF used for malicious redirection.

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://bologen.ru/wix?keyword=will+rats+chew+through+tin+foil PDF link annotation
    • https://cdn.sqhk.co/lumolixuwo/gTgjqib/66684440388.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367000/normal_601dd2c08860f.pdfIn PDF document text
    • https://cdn.sqhk.co/wemorapi/NjVihx3/zawekiketerakidezubub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382407/normal_5ff7871fec835.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409818/normal_60136dc912b07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457572/normal_5fdb75d737274.pdfIn PDF document text
    • https://cdn.sqhk.co/tovozovuzedu/L8Y8gjZ/bullet_force_multiplayer_pc_download.pdfIn PDF document text
    • http://daliadiago.com/mp3_player_mit_apple_music1g8gm.pdfIn PDF document text
    • https://cdn.sqhk.co/figakeves/2ghgiMi/bamodufiribapusofar.pdfIn PDF document text
    • http://mowuvivof.22web.org/big_fish_casino_mod_apk_android_1.pdfIn PDF document text
    • http://vuzopozakobepe.22web.org/guarantco_annual_report.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477863/normal_5fce7a1112eef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vojalaranugun.epizy.com/21749554020.pdfIn PDF document text
    • http://wujoxuledod.rf.gd/zenefeme.pdfIn PDF document text
    • http://zobovobewuw.epizy.com/couple_dance_performance_on_dil_diya_gallan.pdfIn PDF document text
    • http://tunogamux.rf.gd/i_hear_america_singing_worksheet.pdfIn PDF document text
    • http://tuwemajufa.rf.gd/46893752230.pdfIn PDF document text
    • http://riwexakax.epizy.com/wejivazikajabexusuxesubo.pdfIn PDF document text
    • http://valamujunitun.epizy.com/party_invitations_templates_free.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE3 5248 bytes
SHA-256: e582e95b94def393b1fd42fbdaa249049308afdcd3100b91e3c10195482b4f33
font_01_sfnt_off00010ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED4 10620 bytes
SHA-256: 3097244a483665df014e98408ed9aa3b868fed8dddf3e8deed3a6de7622fc1f9

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