Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf3f84a4d0b9cd00…

MALICIOUS

PDF

77.8 KB Created: 2021-03-23 04:06:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: be75c5cab30550cbb963b711e2916f77 SHA-1: 72bbd24f60c9510caba68f93e4869666eb4c5245 SHA-256: cf3f84a4d0b9cd004da11db4f1ee1b8999bd2e1c2a269743f6e23cebeb7ced40
144 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The presence of external URIs and the 'SE_LOLBIN_RUN_COMMAND' heuristic suggest an attempt to download and execute a secondary payload, likely disguised as a software crack. The document body, though heavily obfuscated, contains references to 'extremecopy full crack' and 'wkhtmltopdf', reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=extremecopy+full+crack PDF link annotation
    • https://cdn.sqhk.co/bamosabubesi/gfknSYA/pac_bell_park_stadium_telephone.pdfIn PDF document text
    • https://cdn.sqhk.co/kakapoxavu/7iiigid/27477842642.pdfIn PDF document text
    • http://votixibutiro.medianewsonline.com/xuxabigozuzeli.pdfIn PDF document text
    • http://nuwojukow.mygamesonline.org/sustainable_building_design_manual_teri.pdfIn PDF document text
    • https://cdn.sqhk.co/tozegatopaxu/hfuIjh3/sysco_driver_pay_reviews.pdfIn macro / runtime command snippet
    • http://najetaxu.mygamesonline.org/tidibu.pdfIn PDF document text
    • http://nuwojukow.mygamesonline.org/sustainable_buildIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7b48fea-e836-4c88-92e3-26a23076dcc0/donaxuruwoxizabotejibud.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/62323984774.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/taming_of_the_shrew_act_5_scene_1_translation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f178708b-1deb-40d9-bf0a-1eb550c8bcce/vepini.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d02ec00-3bf1-4108-ac3a-d9a6ed2d400c/92758947649.pdfIn PDF document text
    • http://wuwedilejom.myartsonline.com/hp_designjet_500_ink_cartridge_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/musokejixami/22005442469.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/how_to_see_the_history_of_commands_in_cmd.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/gomijidud.pdfIn macro / runtime command snippet
    • https://s3.amazonaws.com/wunupalezozerud/elenco_codici_catastali_comuni_italiani.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/entrepreneur_magazine_philippines_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/cambridge_dictionary_english_apk.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86F 5176 bytes
SHA-256: be721211972dc13651586d355c31ac0c303b7d55c43a22ac2c6d289a53bf1e02
font_01_sfnt_off0000fa08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA08 20248 bytes
SHA-256: 60ee44843c277243d11bd263168419976a2a59048e1a0685cd4037d99ada79b4

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