Malicious PDF — malware analysis report

Static analysis result for SHA-256 432647825edcd9b2…

MALICIOUS

PDF

95.9 KB Created: 2021-05-15 02:40:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b2078ae25fba1eb63484c7ac7bc1bbf6 SHA-1: d1a41dfc0cf976e489f145c2efc131b3f603bb48 SHA-256: 432647825edcd9b289e5c9625859508c8acfcb0a1744b72763dd901ea45e35d5
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/strik?utm_term=platform+sutra+commentary
    • http://zofugef.mypressonline.com/universal_basic_income_finland.pdf
    • http://miribut.mywebcommunity.org/accounting_for_decision_making.pdf
    • http://artemk.ru/gapopusuzarajir00460.pdf
    • https://cdn.sqhk.co/zipirevofu/igtgfhi/reseninitijuzovekuxekaj.pdf
    • https://cdn.sqhk.co/rizijuwet/jehgfif/pobilibe.pdf
    • http://rerubin.space/xoluzanvbs6o.pdf
    • http://trenketo.buzz/22939537011ser6s.pdf
    • http://vvvvvvvvvvvvvvvvvvvvvb.xyz/puxisiwesosumoczg2.pdf
    • https://cdn-cms.f-static.net/uploads/4459175/normal_603af4876ca2e.pdf
    • https://cdn-cms.f-static.net/uploads/4373511/normal_60445c7b08ed7.pdf
    • https://cdn.sqhk.co/gupetipek/hgheTHs/galaxy_on_fire_2_vossk_ships.pdf
    • https://cdn-cms.f-static.net/uploads/4460255/normal_60468436e04fd.pdf
    • https://static.s123-cdn-static.com/uploads/4411683/normal_5fe4388828353.pdf
    • http://xutusurekawidi.medianewsonline.com/el_modelo_canvas.pdf
    • https://cdn.sqhk.co/tezasevimab/JRC4Tjf/ringtone_apps_for_iphone_xr.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wutisigila/how_to_select_a_target_market.pdf
    • https://s3.amazonaws.com/fujadabez/27342355467.pdf
    • https://uploads.strikinglycdn.com/files/95534c2c-a2ff-40f2-bc1a-75f9f8ad16d7/81097126326.pdf
    • https://uploads.strikinglycdn.com/files/a8c72254-0006-46e5-8116-6991eeff34c3/76465043854.pdf
    • https://uploads.strikinglycdn.com/files/865478e3-7188-451c-9250-0236de3a2627/nufitenusuzotegukojaxid.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_off0000f737.bin
51782992f74b354c1149e99ea65fd734b6245eeeea358a715770ab858142a87d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF737 21004 bytes
font_01_sfnt_off0001385d.bin
9329510dc984ebd3190fb69b0bdc27b62a6c3fb4ea5b9949104256b146eaffc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1385D 5132 bytes
font_02_sfnt_off000149ca.bin
0d5efd0b1b44678303def27004c387efd727f76a9c5c3ffdf83ae7a8aff4178c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x149CA 13048 bytes

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