Malicious PDF — malware analysis report

Static analysis result for SHA-256 f329df8abc0135e8…

MALICIOUS

PDF

79.0 KB Created: 2021-03-14 14:10:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 2b2e7995dc60fe92d32da18b7a19c740 SHA-1: ed68631d2eaeae76b940cb06c4b85250e42c46b4 SHA-256: f329df8abc0135e87d4199af86c6377bc7f57fb54dcb935bc76d6dc7eb2d160f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics as a malicious link farm, containing numerous external links to potentially malicious or phishing websites. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the structure of the PDF suggest it's designed to redirect users to external sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://vilenefex.ru/strik?utm_term=major+barbara+pdf PDF link annotation
    • http://tajizomekoza.iblogger.org/twitch_adblock_android.pdfIn PDF document text
    • http://dazenad.iblogger.org/how_to_make_a_pie_graph_in_word.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385880/normal_603ba61a8fdc5.pdfIn PDF document text
    • http://berezarivire.iblogger.org/zidobimadeletinasadiguval.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495858/normal_60208c336e86d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484635/normal_5fd7cc2cdf9f3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_c6e7081019ab4e01ae2a9dd0b262794b.pdf?index=trueIn PDF document text
    • https://434dcbc4-7bd9-40fe-99bf-e102daebf961.filesusr.com/ugd/07ef24_16f684894a6e4def833e363fc060fb92.pdf?index=trueIn PDF document text
    • https://d4180a97-8dd0-4bf1-9e2f-d1b128d1a64d.filesusr.com/ugd/ae059d_c5fa5400d5924885b17b8881711a51d6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wovugi/braille_reading_answer_ielts.pdfIn PDF document text
    • https://s3.amazonaws.com/dusined/content_plan_template_excel.pdfIn PDF document text
    • https://7ae52be2-ba3c-41fb-8935-29281088223e.filesusr.com/ugd/affaa6_c73ed2e5c9c1465395ae61dc3ad254fb.pdf?index=trueIn PDF document text
    • http://sasoregasot.epizy.com/kaspar_prince_of_cats_worksheets.pdfIn PDF document text
    • http://jejivosijej.rf.gd/biceps_workout_chart_step_by_step.pdfIn PDF document text
    • https://68420551-d949-41c4-975b-2ae86aa6d062.filesusr.com/ugd/09c3c7_95aea5f7aac94d40a3784b6d8e284f53.pdf?index=trueIn PDF document text
    • https://6cda4dd4-8aac-43e7-8003-7c0eea9f7907.filesusr.com/ugd/34e26e_9de799325f4b4a27a52c681fce35bde8.pdf?index=trueIn PDF document text
    • http://lojokedasu.rf.gd/1126588579.pdfIn PDF document text
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_99f54a2908994a6587cfd459c3f1f7a0.pdf?index=trueIn PDF document text
    • https://c580675e-8888-491d-8c80-3106eaac86fb.filesusr.com/ugd/c8a981_6f7503ae6d6546bbae0c13185c25a991.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/dupenutawug.pdfIn PDF document text
    • http://vutakeba.epizy.com/75141985286.pdfIn PDF document text
    • http://fobapisarut.epizy.com/faded_violin_sheet_music_easy.pdfIn PDF document text
    • https://af18ad75-7652-4b25-b9e0-8da5fded0af1.filesusr.com/ugd/529385_24f21f9e21164e9cb77bd790e94cb6de.pdf?index=trueIn 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_off0000f92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92D 5044 bytes
SHA-256: f4382ccf33076374aacaab96735d1093098234bce670bad2b988b91c028788ce
font_01_sfnt_off00010a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6F 10500 bytes
SHA-256: aee8dbc8d03c8333d4132726e82cd988084a5e1c2e441ac57c562e8f0a57be61