Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a4fc9b01b496b0e…

MALICIOUS

PDF

76.9 KB Created: 2021-03-19 08:58:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 325b51124be295de2c28916715ac68cd SHA-1: 75d0a9bc5d843f1b3cf03c17e9a29021f0807467 SHA-256: 7a4fc9b01b496b0e78c1f7abba8e20666542d526674dc99a39e69c7638c60326
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a large number of external links, many of which point to PDF files, suggesting it is part of a link farm or SEO spam campaign. The primary malicious URL identified is https://bologen.ru/strik, which is likely used to redirect users to further malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://bologen.ru/strik?utm_term=proclamation+of+amnesty+and+reconstruction+apush+definition
    • https://cdn.sqhk.co/ligumorik/idsEjdV/sopudanagevotuxepumo.pdf
    • https://cdn.sqhk.co/wepuvumug/vhi65SW/amd_radeon_r5_m330_2gb_drivers.pdf
    • https://cdn.sqhk.co/kewawukufiju/fcrYiet/judelube.pdf
    • https://cdn.sqhk.co/leporolino/182jiKF/coffin_dance_meme_roblox_id_code.pdf
    • https://cdn.sqhk.co/raxasumo/Rjfy6hj/zombie_tsunami_apk_hack.pdf
    • https://cdn.sqhk.co/xizefonuma/hggjgcO/download_fruit_slice_master_unlimited_diamond.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9d964714-1e45-4cbf-9e74-ae56dbe7381e/19526212201.pdf
    • https://uploads.strikinglycdn.com/files/9a102355-3bda-4b16-8473-ce37a18f2811/kudasajavefodopojoro.pdf
    • https://s3.amazonaws.com/wusigipufuvowix/gixaw.pdf
    • https://uploads.strikinglycdn.com/files/906e8e49-ec08-4eb5-b7ec-12eef3168356/the_dialectical_behavior_therapy_skills_workbook_a_new_harbinger_self-help_workbook.pdf
    • https://47e4df30-8702-49a4-8bd5-327e1546ff06.filesusr.com/ugd/379272_a2f727eb20b3494c8c8eaa04c3eb7cc9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7a04d07e-2480-4a5e-84de-c62cd32fd6cb/85695194158.pdf
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_66e9c0328e2b48f38c67ff5fee0c4b5f.pdf?index=true
    • https://s3.amazonaws.com/gofiguj/pan_card_application_form_for_correction.pdf
    • https://uploads.strikinglycdn.com/files/912accea-d60c-47a7-90dd-5024d1246c0d/how_to_fix_nintendo_dsi_an_error_has_occurred.pdf
    • https://f62823ea-e863-4eb7-bd7c-e3bac0139ff1.filesusr.com/ugd/8c639a_d0ae89fa5cd44cf68e397a1a29ca4250.pdf?index=true
    • https://71347f20-8353-4153-bebc-dd2a28b3a5cf.filesusr.com/ugd/a382ee_96c19b4998e54e438a82c0e0e06a982e.pdf?index=true
    • https://1b53f64c-3596-40ff-86ea-95cec8902569.filesusr.com/ugd/838e7e_aa0740354a0a4e97a6320928d371f6f5.pdf?index=true
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_67132e6ad8114f7a99baaa6ca24052c1.pdf?index=true
    • https://s3.amazonaws.com/fotojipifuzitul/caterpillar_generator_service_manual.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_off0000e4df.bin
fb7669b321c107880e77d6992a43d020f341471f5e485aac38eeb6795fbcec88		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DF 5496 bytes
font_01_sfnt_off0000f768.bin
c0e39f44321a474cc328806e737293db5bfd2873d0430c567f64257ef24eb06f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF768 1716 bytes
font_02_sfnt_off0000fff3.bin
efc1f930fff2a559d29d35b389ed2a2db1181daf62d6def710a28a75beee0cb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF3 10940 bytes

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