Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd36b32b87ec69d…

MALICIOUS

PDF

87.2 KB Created: 2021-03-16 10:11:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8392614a01af92fdded1fd62f6824b58 SHA-1: d8501d5987bc16a3d145261cada12f0538fbf8dc SHA-256: dcd36b32b87ec69dcec679e38b0a425031d975eed3f3fbd244b70c2e3cdb8363
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The document body, though heavily obfuscated, contains keywords related to banned prohormones, suggesting a lure to external malicious sites. The presence of multiple external URIs and the ML classifier's high confidence score indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/wix?keyword=what+prohormones+are+banned
    • http://trastenmyqort.online/38625566758n7hjo.pdf
    • http://mavpa.fun/calendar_template_2019_printablewb4nf.pdf
    • http://lazerepil.site/lego_elves_purple_dragon_name3nryd.pdf
    • http://meroxisawifagu.mygamesonline.org/getovokemus.pdf
    • http://mekujoviwe.mypressonline.com/jarepukewarumebotiboza.pdf
    • http://barcaporirternet-interbank-pe.com/rixadoput7pkz.pdf
    • http://mozobadijoba.medianewsonline.com/43392658716.pdf
    • http://ryursew.space/aristotle_the_art_of_rhetoric8w9p3.pdf
    • http://bitcoinlearningcentre.online/runtown_emotional_free_beat5t1b8.pdf
    • http://particuliers-societegenerale.xyz/23389871244bepb.pdf
    • http://wildboost.club/3747845828fqljo.pdf
    • http://vehicleusains.com/how_to_change_rockwell_versacut_saw_bladeg2vze.pdf
    • http://reduslim-italiaoficial.site/969618173967iyi5.pdf
    • http://aydym.club/62596856020d6n9a.pdf
    • http://wbigs.space/free_film_frozen_flower_subtitle_indonesia0zpwm.pdf
    • http://ravovenovibu.medianewsonline.com/jitixukop.pdf
    • http://kungfumalibu.com/55086496827ege0j.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mubemutolewe/gilaraxirusima.pdf
    • https://s3.amazonaws.com/dumupa/updated_alexa_app_apk.pdf
    • http://tefetuzuzip.myartsonline.com/journey_of_man_documentary_summary.pdf
    • https://s3.amazonaws.com/pilazi/teks_factual_report_tentang_binatang.pdf
    • https://s3.amazonaws.com/jedadokuti/45462661514.pdf
    • https://uploads.strikinglycdn.com/files/1e41d2b1-6395-4d48-a83f-3478574460d3/craftsman_88173_not_starting.pdf
    • https://uploads.strikinglycdn.com/files/389022e4-fa22-4f8e-a067-1aae94a78c57/farmall_h_parts_canada.pdf
    • https://uploads.strikinglycdn.com/files/e80143a4-8d3e-46f9-aa62-6a82c7980944/68518038337.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_off00011470.bin
c653074e0ddf4d03b3f60c6b928dfb8019acaf535f8bcc41ead244aafebae65f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11470 5320 bytes
font_01_sfnt_off0001265d.bin
6a90735f076c2ea1fef3301193e4c94adf562e43b9086acddb0fd757cf82b38b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1265D 12192 bytes

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