Malicious PDF — malware analysis report

Static analysis result for SHA-256 513a39c51f053997…

MALICIOUS

PDF

79.5 KB Created: 2021-03-17 17:53:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 49470af625dfcfc79346c31107a34f04 SHA-1: db715e1f26b71a00db6795034f7360298f286934 SHA-256: 513a39c51f053997174fbd6cdb83cdb2899c8febc1937ac6e73ca9ebf4b4f769
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains an embedded URI pointing to 'soxebez.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to 'excel pdf' courses, aligning with a phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://soxebez.ru/award?keyword=course+of+excel+pdf
    • http://xemizawufogutuf.scienceontheweb.net/r12_to_r134_conversion_kit.pdf
    • http://kersita.fun/583024671958ezsd.pdf
    • http://inscarusa.info/3000254166030otn.pdf
    • http://1xbet-sportstavki.fun/the_essentials_of_computer_organization_and_architecture_5th_edition_freekcl8u.pdf
    • https://static.s123-cdn-static.com/uploads/4373986/normal_5fdcf8571bda9.pdf
    • http://sigixexizo.sportsontheweb.net/rig_veda_in_gujarati.pdf
    • http://org-fruit.space/tinejijunuwedizaxugobe08f80.pdf
    • https://cdn.sqhk.co/rawatajizefu/gejj9Lq/37205727426.pdf
    • http://chambre.xyz/tulikunegolagijamaxudizovddhv.pdf
    • http://frut-tree.site/jefesijosibawuwedorisoxtfch.pdf
    • http://damvglaz1.xyz/a_nice_cup_of_tea_book_by_celia_imriehzp2u.pdf
    • http://ogranicbio.fun/329006496168oswx.pdf
    • http://itgermany.net/xitununimalepedaxiluzo1izk.pdf
    • https://static.s123-cdn-static.com/uploads/4460677/normal_5ff4d2d296c57.pdf
    • http://bosuxezaxad.mypressonline.com/multiple_regression_and_correlation.pdf
    • http://bigops.fun/27524819630qy9wf.pdf
    • https://static.s123-cdn-static.com/uploads/4482870/normal_5fca0adb421c9.pdf
    • https://cdn.sqhk.co/detatakev/ujciige/15307621445.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://e1cf253b-b3af-4135-a675-1c3c021177f9.filesusr.com/ugd/111c46_62b6187ed8a640ea89c08877d08af8e3.pdf?index=true
    • https://f635e5d9-31b1-4f19-b758-7a623be10181.filesusr.com/ugd/6cf0f5_cfba240d8b4641e99e5dfdcb7db4c9cb.pdf?index=true
    • http://pupagerirawax.myartsonline.com/nezobepibegurab.pdf
    • http://wejajesenopezoj.onlinewebshop.net/rosapawexumonogoniwekoma.pdf
    • https://e0f910ba-f4aa-4d6b-87f6-24d78cda99ab.filesusr.com/ugd/cc15ef_943c918894c548b7a050795725682b7a.pdf?index=true
    • https://c301b42c-deab-4116-afcd-a09dd0728425.filesusr.com/ugd/4bb894_722b0370a00844baa8d1083f86360db0.pdf?index=true
    • 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_off0000ebfe.bin
9bce53a06f4e8e5d2939420e50b284d76502ab4587456d4f6d3d25e4123b9c5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFE 4680 bytes
font_01_sfnt_off0000fc04.bin
c08028d5253343ee270b1d8c5819712e4479f5f607814a3bdfd8dc0ba36a909e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC04 11368 bytes
font_02_sfnt_off00012280.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12280 4324 bytes

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