Malicious PDF — malware analysis report

Static analysis result for SHA-256 d310f68513c523dc…

MALICIOUS

PDF

81.2 KB Created: 2021-03-25 18:21:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e385e253b926b0bdb719b119342ff07 SHA-1: b8728b8c24b5eb491e1016f5c7d08fb8d65f6330 SHA-256: d310f68513c523dc578330d4c5ea0c0acc3cd2fc28e4fb3ea9e369d9f52699f8
126 Risk Score

Malware Insights

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

The PDF contains an embedded URL pointing to a suspicious domain, identified by heuristics as a link farm on disposable hosting. ClamAV detected this file as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious. The document body, though heavily obfuscated, appears to contain product-related keywords, suggesting a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/strik?utm_term=graco+magnum+xr7+power+piston+paint+sprayer
    • http://fovoxarofej.getenjoyment.net/mossberg_500_forend_removal_without_tool.pdf
    • https://tebafazar.weebly.com/uploads/1/3/4/2/134265880/sezikezur.pdf
    • https://jufesuzukexo.weebly.com/uploads/1/3/5/2/135294717/68f067d8edc86d.pdf
    • http://gibelineg.sportsontheweb.net/standard_kitchen_cabinet_dimensions.pdf
    • https://tekeginisexufu.weebly.com/uploads/1/3/1/3/131381150/71335474bd3.pdf
    • https://telozigigozato.weebly.com/uploads/1/3/4/3/134310186/adce1e.pdf
    • http://tipofeliluget.medianewsonline.com/75290449433.pdf
    • http://zipubezexupoka.mywebcommunity.org/auditors_general_report_2020.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/23dc22bd-0053-4a6d-a0e6-d5dbb3c40341/77767026919.pdf
    • https://f3ea461b-95fd-44cf-949c-5afda193840f.filesusr.com/ugd/a48928_0c6c593865994adc910485668db4b1d9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/53c93a77-0890-4449-9eff-9d16e2c5810b/omron_blood_pressure_monitor_hem-711dlx_can.pdf
    • https://s3.amazonaws.com/foneniz/pioneer_appradio_firmware_update_sph-da120.pdf
    • https://s3.amazonaws.com/goneduzum/css_formatter_plugin_for_notepad.pdf
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_fa566103072343a086f9c88ae341e783.pdf?index=true
    • https://uploads.strikinglycdn.com/files/043b6c91-a658-4679-8caf-737f0a313f8b/biohd-3_error_fix.pdf
    • https://uploads.strikinglycdn.com/files/7b16a864-244b-4a53-b6d9-b0962039fab8/how_to_troubleshoot_a_gas_dryer.pdf
    • https://s3.amazonaws.com/samopakamefap/envelope_budget_system_template.pdf
    • https://s3.amazonaws.com/jazamerijekufol/38274798372.pdf
    • https://s3.amazonaws.com/gezetega/bio_medical_waste_management_2018.pdf
    • https://uploads.strikinglycdn.com/files/dac9812e-e656-4a29-ac3b-9ce04422da5d/is_steel_better_in_tension_or_compression.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1c2.bin
4adc154322bc29d7f70ea62e5e4c5913d0cb966cb243caa7c134d46a10bd6e63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C2 5476 bytes
font_01_sfnt_off00010476.bin
55d402fde7a6777f98f97429d4dfce5b902bcb10ed60f1bb21745d5687dbfcf4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10476 10824 bytes
font_02_sfnt_off00012954.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12954 4324 bytes

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