Malicious PDF — malware analysis report

Static analysis result for SHA-256 4167226aa1a3b4af…

MALICIOUS

PDF

75.1 KB Created: 2021-03-18 08:52:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4207840f6d7877af3055160a99d863dc SHA-1: 78bbbdbda8cd99df65ac8daa47541f3ceadc7578 SHA-256: 4167226aa1a3b4afccd0d95b08743f2dd0d64c606c4860f700bfb59e6ddcadff
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a common tactic for SEO spam or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://soxebez.ru/wix?keyword=turn+off+redirect+notice+chrome
    • https://cdn-cms.f-static.net/uploads/4369632/normal_5fd384e164fd2.pdf
    • https://static.s123-cdn-static.com/uploads/4385410/normal_5fe449af6b210.pdf
    • http://arthromedshop.xyz/carrier_thermostat_wiring_tp-_pac01_manualsmgwd.pdf
    • http://myfavoritesun.xyz/dark_heresy_ascension_classeshw2e0.pdf
    • https://cdn.sqhk.co/nefikelifu/az4i1J7/hat_tricks_tampa_happy_hour.pdf
    • https://cdn.sqhk.co/fupetabuwuf/igDljh4/ice_hockey_goalie_drills_for_beginners.pdf
    • https://cdn-cms.f-static.net/uploads/4367644/normal_600adc95741db.pdf
    • http://potolkilife.ru/bojefasokesiv9ktix.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0fdd9f25-8366-4660-9463-376fd915ad39.filesusr.com/ugd/c16cf9_5279938300c44301a6a1d59507b2fd9c.pdf?index=true
    • https://f1c0478e-57b3-422a-b8eb-433964b677d2.filesusr.com/ugd/16c17d_84f12e8cf2b9425493f81d60393cda41.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d6cece42-735f-4a54-aa9d-8aa330967490/bilifisalosituwu.pdf
    • https://uploads.strikinglycdn.com/files/84a3cdb7-7528-4f49-a62a-5a5179cee955/how_hard_is_it_to_get_hired_at_walgreens.pdf
    • https://uploads.strikinglycdn.com/files/73d051a8-f035-4dcd-80ed-e55d877e58f5/27037687457.pdf
    • https://uploads.strikinglycdn.com/files/78c58cd6-ef8a-4ece-9f8c-044c28b8ce90/34777818364.pdf
    • https://uploads.strikinglycdn.com/files/408771bb-f4f5-4ec3-a712-893303ca2e12/15825873363.pdf
    • https://uploads.strikinglycdn.com/files/7ca5b9d1-ac42-460e-9a46-1819f261b6b0/briggs_and_stratton_vanguard_16_hp_vertical_engine_oil_capacity.pdf
    • https://064d663d-f6b2-44cf-a6ad-083da5f315e5.filesusr.com/ugd/77eba6_23db42cbdf8c41b2925309282e643e90.pdf?index=true
    • https://uploads.strikinglycdn.com/files/43c85b8c-ea70-4b5d-9b5f-4896135b61bf/lojulemimarodasi.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_off0000e105.bin
8ba45b22eed5597d756b042451ec0eac06bd0165e4e304719c9c73024c8c93d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE105 4792 bytes
font_01_sfnt_off0000f11e.bin
21a7146106e2ad29a4dcc6aa55cee169416400570e2b3d493b6d071cb256f2f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF11E 1936 bytes
font_02_sfnt_off0000fa60.bin
923f61cb181c27d02a760c6ded4576a5aa01c9269db02162fd5170848aa5bc3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA60 10596 bytes

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