Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b18c73e3812ea5e…

MALICIOUS

PDF

66.9 KB Created: 2020-12-18 10:39:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a4f336d4b5c80e259eb82891ddd6da4a SHA-1: 190e3bfd2431ab238c12b02e3e4a3750ce12eaf1 SHA-256: 2b18c73e3812ea5e448c5d5fb9374cc7155245eeb1e718eeb2c1c109a99be954
96 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains an embedded URL pointing to 'traffset.ru', which is likely used to redirect the user to a malicious site or download a payload. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffset.ru/strik?utm_term=dipiro+pharmacotherapy+handbook+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381544/normal_5f99c978aaf77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409246/normal_5f99165466d09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448126/normal_5fa1b676c7eea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454973/normal_5fd623d4d1e59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380076/normal_5f8eddc475212.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470841/normal_5fb3a3f16dacc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404313/normal_5fc6f52f59702.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/7bfc1aaa-e973-45e1-a4fe-3591bb6c7d68/lasusogoxezivegenapibofa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f013454-0f5c-4537-800a-1592f8cb8e33/88359340490.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc29a73239b0722913c2875/t/5fc6e9a43ac9c763f4c88ddf/1606871463320/solar_battery_charger_harbor_freight.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0c666116eb00e3c4b5099/t/5fc3ca5f61e25426e1abb8aa/1606666854143/need_for_speed_no_limits_hack_apk_android_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b697ac0-2ab0-4577-a0be-a66d08949575/dizujer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9a17a8a-6a97-4a6e-9186-4d564d22786a/kawamazebabekevigema.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a8b9e32-8291-4ca6-ae57-fd5f2c72c04d/dna_replication_coloring_worksheet_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8093b90-47a8-4be6-8fd0-1f78d2e9aa19/metro_multifamily_housing_association.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/938f6196-23d2-41a6-93d4-d9b22f32f5fa/13232438937.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE5 5276 bytes
SHA-256: b2df34c9a4eb27641846fe2c68d4012c74831c294f3502ccd46e2fe598b56cad
font_01_sfnt_off0000ceac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAC 9868 bytes
SHA-256: 406cef4f1bc55930cfa773fc43cf47b50d110f5c01d1715812b5b31abdf6f29b
font_02_sfnt_off0000f048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF048 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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