Malicious PDF — malware analysis report

Static analysis result for SHA-256 07939c4305ddda27…

MALICIOUS

PDF

90.0 KB Created: 2021-06-06 05:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 99e6f005a3148df5d156efdf275e042d SHA-1: 9bc611a839081b0ff34fca9fe246b7093c08719c SHA-256: 07939c4305ddda273068e5080f9b2cc245b1365a0f5a9612f866fd7f58b36a5e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://queure.ru/pbw?utm_term=music+streaming+services+quality+comparison PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501789/normal_604ef0fc389e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494166/normal_600517ef56ca8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419235/normal_5ffce401e37ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369316/normal_6050d84ba913a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505358/normal_6028f0dadc916.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403822/normal_606d3aa08bcb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369640/normal_5fd93873e8b43.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392452/normal_5ffaa3eb79318.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4369926/normal_60b1ff19daacf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/547eaec7-1d8c-46cb-be1f-3004e449048b/86530160403.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/423ec12d-0b22-4424-8b9c-ddacc2a14b56/do_you_have_empathy_or_feel_empathy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fa2ecab-30c3-4c28-ae70-d391c6312dea/siwoka.pdfIn PDF document text
    • http://kufujibumufa.pbworks.com/w/file/fetch/144423885/10030622890.pdfIn PDF document text
    • http://pewudomame.pbworks.com/w/file/fetch/144617043/qualified_opinion_audit_report_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f9ac7d7-d6aa-4183-a4e2-97d34160ebc5/46828004734.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9290549-72a1-4b8f-9760-2393fe9fa814/dark_sun_boxed_set.pdfIn PDF document text
    • http://zuvevetub.pbworks.com/w/file/fetch/144577584/86951057504.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/379f8fd8-fe1b-488d-971a-45de4d59647c/89415489569.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d8b521c-292a-420f-afdb-0bdb21dd2f77/bluejacket_ok_weather_radar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aba99c43-d3e1-450f-be08-a413b74b4407/pentair_easytouch_control_panel_manual.pdfIn PDF document text
    • http://pilujibos.pbworks.com/f/super_smash_bros_brawl_legacy_xp_wii.pdfIn PDF document text
    • http://subazim.pbworks.com/w/file/fetch/144544935/javaguvojanusaje.pdfIn PDF document text
    • http://nosiravuga.pbworks.com/w/file/fetch/144673791/fixukotorize.pdfIn PDF document text
    • http://jitijaloj.pbworks.com/w/file/fetch/144511536/radhe_krishna_ki_jyoti_alokik_mp3_download_pagalworld.pdfIn PDF document text
    • http://najapenoz.pbworks.com/f/the_hound_of_the_baskervilles_in_bengali_download.pdfIn PDF document text
    • http://tiduxikuve.pbworks.com/w/file/fetch/144421821/new_bible_dictionary_3rd_edition.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_off00012178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12178 5544 bytes
SHA-256: 3f4cf08cd1a3a42f6a0013459448bd89d918045d3877dd6cdcf51f8fe4a3ca66
font_01_sfnt_off00013459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13459 11040 bytes
SHA-256: a92cdbae9d1fc830a4070ef9de7e3b44dfe38821d1991b4bcb267bccada2299b