Malicious PDF — malware analysis report

Static analysis result for SHA-256 c738ede74d0f9aa6…

MALICIOUS

PDF

98.2 KB Created: 2021-03-15 19:45:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 742d899e2ed996d99935cc582d3ec771 SHA-1: 2bbef8570dc689dfd6cd791811a16be229f899eb SHA-256: c738ede74d0f9aa66efbca837559e71fd89270d604fa175a94b8ba1a1036baf0
96 Risk Score

Malware Insights

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

The ML classifier and ClamAV both strongly indicate maliciousness. The PDF contains an embedded URI pointing to 'dafemum.ru', which is likely a phishing or malware distribution site. The document body, though heavily obfuscated, appears to be a lure related to technical instructions, consistent with phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://dafemum.ru/strik?utm_term=how+to+pair+dish+remote+to+polk+soundbar
    • https://cdn.sqhk.co/kimorotadopo/ez3d21x/hill_climb_racing_game_2_hack.pdf
    • https://cdn-cms.f-static.net/uploads/4454419/normal_6017dbb4f0007.pdf
    • https://cdn-cms.f-static.net/uploads/4415537/normal_6034288326438.pdf
    • http://instofficial.online/how_to_fix_a_dishwasher_that_wont_fill_with_water665ul.pdf
    • https://cdn-cms.f-static.net/uploads/4421478/normal_5fe930ec4f91f.pdf
    • http://runolive.com/83436270572vz9o5.pdf
    • https://cdn.sqhk.co/ropimipaf/ge6gfji/davapomelivojodeteg.pdf
    • https://cdn-cms.f-static.net/uploads/4368950/normal_602b57a43a443.pdf
    • https://cdn-cms.f-static.net/uploads/4485573/normal_6042e26cf13f2.pdf
    • http://repair-monokoles.ru/jolly_phonics_grammar_2_pupil_book0uz8j.pdf
    • http://nibelv.xyz/ejercicios_ecuaciones_de_primer_grado_2_eso5nqmh.pdf
    • https://cdn-cms.f-static.net/uploads/4453335/normal_5fd87aad3630f.pdf
    • https://static.s123-cdn-static.com/uploads/4485702/normal_5ff51db47a190.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dowafirowelumex.atwebpages.com/58821774578.pdf
    • http://pizuzol.onlinewebshop.net/tetajof.pdf
    • http://paguxesij.myartsonline.com/sexadatar.pdf
    • http://zajupulavofawi.myartsonline.com/convert_to_word_document_zamzar.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_off00014158.bin
46462d5133ca5a65326a5095cbbe8bf47f0dc0fb697d8678341a4a82dd062dbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14158 5456 bytes
font_01_sfnt_off000153be.bin
42210371aa551d348c3b02be8d24a2c76226be8cbfbb40d03984a9ddaeb1f66e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x153BE 11636 bytes

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