Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0e5c8926004510b…

MALICIOUS

PDF

76.3 KB Created: 2021-05-03 11:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 71cff01174e323e461ec51c27edee423 SHA-1: 2d22ce15d16c7856269b2d722de854770f7fc505 SHA-256: f0e5c8926004510b5dfb9c6c72255a9ef32fff0f7fdbdfff4b52f715b75c4d24
96 Risk Score

Malware Insights

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

The file is a PDF containing an embedded URL that points to a suspicious domain, identified by heuristics as an external URI and flagged by a machine learning classifier and ClamAV as malicious. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the URL itself is presented in a context that mimics a legitimate document title. The primary IOC is the malicious URL, which is likely used to deliver a secondary payload or conduct a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://vilenefex.ru/strik?utm_term=a+theory+of+human+motivation+abraham+maslow+pdf PDF link annotation
    • https://vifojozajo.weebly.com/uploads/1/3/1/4/131454549/kumagujurelanubof.pdfIn PDF document text
    • http://gixanexebo.22web.org/dictionary_english_to_tamil_download.pdfIn PDF document text
    • http://mon-cmbretagne.com/zonafuredikazerewagdkji4.pdfIn PDF document text
    • https://lanasasaf.weebly.com/uploads/1/3/0/8/130815311/9fffc302f6f2cd.pdfIn PDF document text
    • http://digitalcalakk1.xyz/29309024761pw8fq.pdfIn PDF document text
    • http://fibaxoxadomi.sportsontheweb.net/my_car_says_service_tire_monitor_system.pdfIn PDF document text
    • http://dororuminaxa.mywebcommunity.org/tadokobagigodizapegiv.pdfIn PDF document text
    • http://tinewipikawulu.iblogger.org/34057492528.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://161abad2-7de2-49bb-9904-d6e2a620a662.filesusr.com/ugd/2eec94_5d8256269b324c9daabd6cd247d15abb.pdf?index=trueIn PDF document text
    • https://e86c6366-0652-46cb-9e1f-5633a133dba9.filesusr.com/ugd/510a18_9032aa6c6b804bdbba9eddc60aaf7569.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/telasebisu/melexufi.pdfIn PDF document text
    • http://fezivepe.rf.gd/basketball_net_swish_sound_effect_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/835734973.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/how_to_program_raynor_garage_door_opener.pdfIn PDF document text
    • http://zoxizagujaniru.epizy.com/what_is_series_in_bosch_washing_machine.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/anatomy_and_physiology_integumentary_system_worksheet_answers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ded7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED7 5548 bytes
SHA-256: 1855e2133c8de62c127ac430c9bc7420b6ba753f585f8921e14ea9479a0e7879
font_01_sfnt_off0000f1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A2 10624 bytes
SHA-256: 52b56c36fc6c480fc06263d55d28ecd9cc64677e53db33309e8fe3574737cc67
font_02_sfnt_off000115ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EE 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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