Malicious PDF — malware analysis report

Static analysis result for SHA-256 705fb0c0cdfae739…

MALICIOUS

PDF

81.7 KB Created: 2021-04-03 04:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 268ecdc9b700824e271b7d5a9654ae17 SHA-1: 2f160a60b346d4869f19c6dbf0b26d84fe3d9e29 SHA-256: 705fb0c0cdfae7396778dda20217306fffef9bcf64176311057c749864b154b9
184 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The ML classifier also assigned a very high probability of maliciousness. The embedded URL points to a suspicious domain, likely serving as a lure 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=ensnared+a+g+howard+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4447273/normal_5fc905706f1a9.pdfIn PDF document text
    • https://cdn.sqhk.co/lobinazema/QyTjifd/theme_park_app_game_cheats.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444117/normal_5fd2c40f3ab66.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366395/normal_5fe03851b2ef5.pdfIn PDF document text
    • https://cdn.sqhk.co/totafeta/kQieia4/banco_do_brasil_sacramento.pdfIn PDF document text
    • https://cdn.sqhk.co/wagomito/jDc5Bje/64272971659.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/260c1bc4-9cde-4e75-8153-3026f5979773/brother_mfc_7340_drum_error_troubleshooting_and_routine_maintenance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/184d3258-b883-4af2-9b4e-664c2a3cdd8b/panezadiwodakub.pdfIn PDF document text
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_ef83c41c825e41199d58a671fe1c9659.pdf?index=trueIn PDF document text
    • http://wasupudunufol.rf.gd/dalakatigutuje.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/fujunubaluvotutan.pdfIn PDF document text
    • http://gidimuni.epizy.com/94951172312.pdfIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/xoxixogotiloledimilopude.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b3dd6fb-fdf0-40f8-9b54-2a328df3c27d/sennheiser_ew_100_eng_g4-a1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aef9ce56-3af3-4b06-bb54-915f2234a530/can_i_make_seltzer_water_at_home.pdfIn PDF document text
    • https://44f68060-d5e3-4d58-b4e7-e3760392f352.filesusr.com/ugd/49488e_15cb1650d60a4d239dcab3597aa61e01.pdf?index=trueIn PDF document text
    • https://a1d1c4ac-cf1d-4c58-861c-45d1188f4b60.filesusr.com/ugd/052f3a_59547428ca8a4ebfb5de303494ac6760.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC12 5320 bytes
SHA-256: 958a349c9755ad6b9d038939ec16ce0269bacc73a33ed032d14fb401776d39ec
font_01_sfnt_off0000fe3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3F 11332 bytes
SHA-256: ce20c14bed52ccb8aa9e39b3e7c2ee580606a654b8ec83781d91b28046a70260
font_02_sfnt_off0001250d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250D 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67

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