Malicious PDF — malware analysis report

Static analysis result for SHA-256 a746595ddee6e938…

MALICIOUS

PDF

78.6 KB Created: 2021-03-25 05:21:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8364a8a8209e8dd1450aa50d1753ba4a SHA-1: d7cd8af0e494becc37b2508d31d24d6208e2e024 SHA-256: a746595ddee6e938768f2f1c4ef914308aba52c7ec6f499cfa6c5dd305208f95
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous external URIs, with one prominent URL pointing to 'ponafet.ru', suggesting a phishing or malware distribution attempt. The PDF structure and embedded links indicate it's part of a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/strik?utm_term=what+are+the+main+themes+in+the+merchant+of+venice
    • https://dulewidojupetor.weebly.com/uploads/1/3/2/6/132695372/6489397.pdf
    • https://najijufo.weebly.com/uploads/1/3/4/7/134714833/jiwimizofezu.pdf
    • http://nepoxiduvilej.scienceontheweb.net/english_grammar_adverbs_exercises_with_answers.pdf
    • https://runizupila.weebly.com/uploads/1/3/4/3/134320381/taxepalofa-daxasodorizozo.pdf
    • https://cdn-cms.f-static.net/uploads/4390995/normal_6017182a62419.pdf
    • http://ing-jobs-opportunities.com/lucky_block_minecraft_ps4r39h1.pdf
    • http://wotaxatumumodok.sportsontheweb.net/pikidepubulakoriregazuz.pdf
    • https://werevofapopaja.weebly.com/uploads/1/3/4/4/134492388/479ff2598f639.pdf
    • http://energierecrute-emplois.com/what_is_the_theme_of_the_joy_luck_clubjibex.pdf
    • http://tonagruz.ru/can_you_talk_through_night_owl_cameras46h9z.pdf
    • http://xuxijosut.sportsontheweb.net/mathematical_logic_class_12.pdf
    • https://cdn-cms.f-static.net/uploads/4416675/normal_6014535ecede3.pdf
    • http://jedilinosur.mywebcommunity.org/55626763543.pdf
    • https://cdn-cms.f-static.net/uploads/4401517/normal_601ae30713576.pdf
    • https://kelezisexuva.weebly.com/uploads/1/3/0/7/130739204/webutofoxuxewox.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/donukadizolin/86661925937.pdf
    • https://uploads.strikinglycdn.com/files/9dbaf0ae-e581-4be0-a42a-99c08f1dd5c0/vapojikasidekoguk.pdf
    • https://s3.amazonaws.com/nefunupu/brastemp_frost_free_inverse_manual.pdf
    • https://s3.amazonaws.com/fakuguvil/business_communication_for_success_university_of_minnesota_libraries_publishing_edition_2015.pdf
    • https://s3.amazonaws.com/dowavelaxam/32009153500.pdf
    • https://uploads.strikinglycdn.com/files/e5838f01-c978-46b1-bc30-3795f7cb4909/55947852419.pdf
    • https://uploads.strikinglycdn.com/files/aeceef4c-9b22-468a-8878-2361ecb1d986/32853370144.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f737.bin
f5f3280ed634495d1417ea3140be4f48e5e384fffe6cc71016d74412a590ac0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF737 5164 bytes
font_01_sfnt_off000108ae.bin
ce6b6b290834fb571b417165f6b94ea6db4f8d1a5203bc678872991f9f18c3d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108AE 10480 bytes

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