Malicious PDF — malware analysis report

Static analysis result for SHA-256 915b55d9427b134a…

MALICIOUS

PDF

164.6 KB Created: 2021-03-25 10:58:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e42da2807ab19a29e100a7581c89ea64 SHA-1: dfd41540a91809952b0921328aa5a9ad14e2c1f1 SHA-256: 915b55d9427b134a5704971879bcb76cc0d69d7f9645b65a1ade05da21cc3251
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://vilenefex.ru/wix?keyword=cuaderno+practica+por+niveles+1+answers
    • https://cdn.sqhk.co/wejideduv/tqjayMR/furadakafanopan.pdf
    • http://semengergel.ru/497054986338rn6f.pdf
    • http://fastpeysistem.online/mixizesakiruxaz9po57.pdf
    • http://vizit.store/what_type_of_oil_does_a_lawn_boy_mower_takehzbak.pdf
    • https://cdn.sqhk.co/zetanitanedo/Bhjdhji/mubedubedoz.pdf
    • http://jidapuxedepu.medianewsonline.com/japanese_mythology_books_barnes_and_noble.pdf
    • http://vibolofisef.mywebcommunity.org/61568881386.pdf
    • http://table-wait.com/lukogotuzowik2sfl.pdf
    • http://apsdd54gfv.xyz/exo_members_currently_in_militaryxdin1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://38aad9b5-7a72-45b8-ac81-9fe73ce82000.filesusr.com/ugd/08338c_d7ea7974ec3548c78c744c5c5e69705f.pdf?index=true
    • https://s3.amazonaws.com/widofafane/88356893283.pdf
    • https://288c7b4b-0494-48f6-8ee2-9dd519b96b0a.filesusr.com/ugd/a107db_fde3bd83dacb4d02bde606136b997498.pdf?index=true
    • https://s3.amazonaws.com/mejados/pinijuwibow.pdf
    • https://uploads.strikinglycdn.com/files/999b2f99-158b-400b-8198-cc8c22f24acd/gre_word_list_with_mnemonics.pdf
    • https://uploads.strikinglycdn.com/files/a6fb32db-b241-4737-a6fe-6362022d54eb/what_are_the_theories_of_learning_in_educational_psychology.pdf
    • https://s3.amazonaws.com/midipes/skylake_vs_haswell_performance.pdf
    • https://7f3dc8b3-869c-44c5-82eb-14ae88d57796.filesusr.com/ugd/dc4ca1_5936eecf80174f06b09118896ebb020a.pdf?index=true
    • https://s3.amazonaws.com/begijufadi/cowon_plenue_v_review.pdf
    • https://s3.amazonaws.com/peveziwoguxuzam/formalits_cession_fonds_de_commerce_greffe.pdf
    • https://uploads.strikinglycdn.com/files/8f2bc087-077f-4047-9c8a-7cd3a34660db/forty_rules_of_love_elif_shafak_quotes.pdf
    • https://uploads.strikinglycdn.com/files/8bea46de-6428-42ab-ad18-e6c2ed8c3b13/how_to_clean_oreck_xl_vacuum.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_off000243d9.bin
707b8f2567d5089b5cb7328be78155948ce557ebbe392d148f0ce5a68622edba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x243D9 5176 bytes
font_01_sfnt_off00025596.bin
6edf6cbedac8815570fb8587cd69e6a59838c9f6c0417e13250068cfe9d1f898		 pdf-font-stream PDF embedded font (sfnt) at offset 0x25596 14280 bytes

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