Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d9db84152530b84…

MALICIOUS

PDF

71.4 KB Created: 2021-03-04 02:19:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6c2917941639c50bb67ab7b09fec1278 SHA-1: 7b3452686f1ca2ab80d2d60d8f7d84d78d8f3ff7 SHA-256: 3d9db84152530b84cacbb5286ac8cc45c096e209db6867bb4e41c72ceed40cd7
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that likely serves as a lure or a download source for further malicious content. The document body, though heavily obfuscated, suggests a disguise as a service manual to trick users into interacting with the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/wix?keyword=taotao+atm50-a1+service+manual
    • https://cdn-cms.f-static.net/uploads/4422914/normal_6033654e8a9e9.pdf
    • http://sajiwurejedetu.sportsontheweb.net/17744783202.pdf
    • https://static.s123-cdn-static.com/uploads/4489263/normal_5fe4fbc7a27da.pdf
    • http://nitesufi.sportsontheweb.net/85721377213.pdf
    • https://cdn-cms.f-static.net/uploads/4386073/normal_603fd660a6e88.pdf
    • http://wumomotetidofe.getenjoyment.net/are_harvester_ant_bites_dangerous.pdf
    • https://cdn-cms.f-static.net/uploads/4414352/normal_601d87e7bf46d.pdf
    • https://cdn-cms.f-static.net/uploads/4446925/normal_60285cc58f411.pdf
    • http://leledup.mypressonline.com/carreras_universidad_del_valle_buga.pdf
    • http://punejew.mygamesonline.org/scottish_snare_drum_rudiments.pdf
    • http://zenajok.medianewsonline.com/16493255105.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/metubevozisul/6631383304.pdf
    • https://s3.amazonaws.com/numegubowalonan/60274121700.pdf
    • https://s3.amazonaws.com/bidurudilidujug/free_whatsapp_for_pc_2019.pdf
    • http://sutexuvidag.myartsonline.com/bible_verses_related_serenity_prayer.pdf
    • http://wiloradakuno.onlinewebshop.net/excel_formulas_vlookup_in_hindi.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_off0000daa0.bin
8e74dcb30c8136a7416ee2b4445752592dd64d0cbbc017b387fa00eccd1e28bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA0 5304 bytes
font_01_sfnt_off0000ecac.bin
a5968c8e4c33bba5f7cf8b15ac7bb4842c0a31c41531b5d2acef298461bdb4b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECAC 10644 bytes

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