Malicious PDF — malware analysis report

Static analysis result for SHA-256 963dbe89c4bd5b8e…

MALICIOUS

PDF

166.7 KB Created: 2021-03-10 20:35:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7d20455e0a3933d4eace444e80bb2567 SHA-1: d7def0be49bb91288b08ff06818652318ce79a59 SHA-256: 963dbe89c4bd5b8e34bc144c8de6a93ed826d09450774adcf31d93b068999263
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://zajinet.ru/123?utm_term=laurentide+ice+sheet+flood PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369653/normal_6035a04d7cc2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488809/normal_603f559039364.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393489/normal_6039ad8c67bd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498997/normal_60334ecfd7750.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392861/normal_5fdb07e7487e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446490/normal_6042239fb2d5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454691/normal_603a910198172.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465151/normal_5fd620ac53c86.pdfIn PDF document text
    • http://tisimewifexumi.iblogger.org/60405113075.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kovilowab/dazuma.pdfIn PDF document text
    • https://ed7c5604-ec0f-4ae6-9d22-6d534b57d154.filesusr.com/ugd/1d5a3f_c3a7abde1daf40c1850893ba0aeb80c1.pdf?index=trueIn PDF document text
    • http://faguvixin.rf.gd/20679369540.pdfIn PDF document text
    • https://f395d2f2-f939-483b-815f-81062d4747ff.filesusr.com/ugd/be2697_db881cc068544482bc6a4de157bddbc1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/do_you_get_a_formula_sheet_on_the_sat_physics.pdfIn PDF document text
    • https://8137cd1e-393d-4948-8193-eca935452849.filesusr.com/ugd/756799_b01608193c4c4c72bc8c9ab5bce1f191.pdf?index=trueIn PDF document text
    • http://jenepopavuse.epizy.com/60283564558.pdfIn PDF document text
    • https://48bf584d-d56c-45cf-b4f3-c1c05dce5274.filesusr.com/ugd/3f4b99_ec8d2825c3df40d99f2b48eab2d7bcb2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pogolo/67977572584.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/fasodek.pdfIn PDF document text
    • https://27dd58ca-3bab-4825-b0a2-cb75a9f796de.filesusr.com/ugd/aba4c5_7cacd0f3ad874435b21a64fe96cc090c.pdf?index=trueIn PDF document text
    • http://bijamujijupife.epizy.com/days_of_the_week_coloring_worksheets.pdfIn PDF document text
    • http://jikorali.rf.gd/english_grammar_worksheets_grade_6.pdfIn PDF document text
    • http://birifamabaxum.rf.gd/xisilelilaroxifezobuku.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000259a7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x259A7 28788 bytes
SHA-256: 39b6e9cde21aece79567bc416ac51cca3cf417efe5b8417bad4fc031c6c1451e
font_00_sfnt_off00021cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21CB7 5052 bytes
SHA-256: 41ff797b0efdd8f273d34570de6db109fd4a7eadaa9c43704a052ec8b3204fb0
font_01_sfnt_off00022de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22DE0 13444 bytes
SHA-256: 2137ee9d622be1b9ebe661bb912dacdaf7cbfd362d4c7131fb51a741ef55da9c