Malicious PDF — malware analysis report

Static analysis result for SHA-256 89536477306a98c6…

MALICIOUS

PDF

91.5 KB Created: 2021-06-08 08:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 85c8b0e7a97138180b1a09d72f09f626 SHA-1: 04d661ac4bcfedbc4f671e2a70ac9196524f0b6e SHA-256: 89536477306a98c63e7c3dcc68f744ca9604889d68d5396f4c898169af15a956
134 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous external URIs, including one pointing to 'laborke.ru', suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/pbw?utm_term=alternate+future+of+the+world+canadian+mapping PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368740/normal_60031bf4772bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368238/normal_6067e9207ac27.pdfIn PDF document text
    • https://gibunuvupu.weebly.com/uploads/1/3/4/7/134746488/11bc2c2f.pdfIn PDF document text
    • https://bopazexujow.weebly.com/uploads/1/3/4/8/134876268/5044725.pdfIn PDF document text
    • https://wajuzetixageg.weebly.com/uploads/1/3/0/9/130969085/aa47fca20db45.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478422/normal_5febf01067208.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421624/normal_602c8e3c3974c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416319/normal_60426ed8f2ea9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mawasuwov.pbworks.com/f/5975893261.pdfIn PDF document text
    • http://kikipudojuzo.pbworks.com/w/file/fetch/144510471/bloody_roar_2_descargar_para_pc_gratis.pdfIn PDF document text
    • http://bojirakaj.pbworks.com/f/frontline_commando_2_mod_apk_and_data_obb_file.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19480510-1bc6-4939-af56-ec6d3b1626b9/homer_iliad_odyssey.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f60f6bc4-0dbe-4ce4-a24e-af9d71b266bb/rirezazafopuwipob.pdfIn PDF document text
    • http://bajupuko.pbworks.com/w/file/fetch/144832704/cual_es_el_sistema_financiero_peruano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5fd2edc-b4e7-4f8a-ba8c-f688a1e7863c/weight_training_regimen_for_runners.pdfIn PDF document text
    • http://zexowisam.pbworks.com/w/file/fetch/144838035/general_bible_quiz_questions_and_answers.pdfIn PDF document text
    • http://mavujeridolu.pbworks.com/f/bardo_thodol_portugus.pdfIn PDF document text
    • http://fetinaduv.pbworks.com/w/file/fetch/144821844/multiwii_2.2_software_download.pdfIn PDF document text
    • http://jedilukiwo.pbworks.com/f/english_praise_and_worship_mix_mp3_download.pdfIn PDF document text
    • http://jojekepodef.pbworks.com/f/flappy_bird_unblocked_flash_games.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12ac7397-5a96-43c9-a36c-b167ead2df4f/ccs_c_compiler_free_download_crack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/657e32f0-1616-48af-a80f-bd5a5d86d607/44188176957.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12698 5472 bytes
SHA-256: 23a0874f33077897f320aba493880a11404171a4821407110b85b9efe3c0f92d
font_01_sfnt_off00013921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13921 11796 bytes
SHA-256: 03ce67d663806b6f623a347be2feb844b374b76af731feb28a8bcb72cfd468cf