Malicious PDF — malware analysis report

Static analysis result for SHA-256 de7e22925e3c01b6…

MALICIOUS

PDF

73.8 KB Created: 2021-03-30 21:07:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 491a2f4d683eaa0fc98365102dc2bd66 SHA-1: 46254a083af77ac6392527e72d92304d7421ade7 SHA-256: de7e22925e3c01b62c9a3b873ae8104e27bb61073fbe73639bd780f6e6669ffb
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. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically highlights the nature of the embedded links as a tactic.

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://kuzutuzo.ru/wix?keyword=presto+percolator+coffee+filters PDF link annotation
    • https://cdn.sqhk.co/kogujipubap/aNjh8iR/football_manager_2020_squad_status.pdfIn PDF document text
    • https://cdn.sqhk.co/veletafi/ghZjiha/tom_s_burgers_25_menu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388173/normal_6006af0482a88.pdfIn PDF document text
    • https://cdn.sqhk.co/sofetarunox/uhe4Pgf/golden_boot_premier_league_2019_20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383801/normal_602fe49b242fb.pdfIn PDF document text
    • https://vudizexifaret.weebly.com/uploads/1/3/4/3/134314381/kolugeze.pdfIn PDF document text
    • http://risejesifisem.22web.org/atkins_induction_phase_foods.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414688/normal_5fcef548454d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384832/normal_60205c76d54c8.pdfIn PDF document text
    • https://juwopivevonu.weebly.com/uploads/1/3/4/6/134682880/014e909cb564.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485696/normal_6012b7ff7f1f2.pdfIn PDF document text
    • https://fimedezederuru.weebly.com/uploads/1/3/4/8/134884956/bedekepiwixupim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6974b9b2-fc2a-4e9b-9495-84ff65489eb7.filesusr.com/ugd/395280_4bc10c4d635d4791b857603cd3e43b47.pdf?index=trueIn PDF document text
    • http://tixinova.rf.gd/mowajufalaza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f629c64a-66c8-4d3f-818f-4d868176abf3/husqvarna_435_carburetor_removal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67f28ce6-dfbb-4cd9-bbff-cf2097562996/small_engine_rebuild_shop_near_me.pdfIn PDF document text
    • http://novufojanaka.epizy.com/zasomisikitepugopiruko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4d88ef2-06f6-43c6-a27c-3c1ecb243010/68227329565.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9aab2755-47f4-4445-922f-0f858806dc19/kepejuguvusarosukid.pdfIn PDF document text
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_39d56a5f6c09492fb82815c2e81ba5d5.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE278 5008 bytes
SHA-256: 0c6b12fbc067d6eed0637b2169c148e6b848a02f31ee6056f404d566ac07eef0
font_01_sfnt_off0000f390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF390 11320 bytes
SHA-256: 7262143f24a0011bb29e89d8e57485e9b29268c844bd03179343d626f77280e9

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