Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a5e342791a225f7…

MALICIOUS

PDF

86.6 KB Created: 2021-04-19 20:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 966f241b8ea244e98a0b70735bec2b2d SHA-1: 2adc1530abbc7dde3972d40c1ef52ebaf7010304 SHA-256: 3a5e342791a225f7e25c7559ed14b8cc513bcbbd910e21c32d5de92c148983cf
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. One of the embedded URLs, 'https://lozipotod.ru/strik?utm_term=vietnamese+guerrilla+warfare+manual', is flagged as unknown reputation, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lozipotod.ru/strik?utm_term=vietnamese+guerrilla+warfare+manual PDF link annotation
    • https://cdn.sqhk.co/ramazunor/geviahc/64973221843.pdfIn PDF document text
    • https://cdn.sqhk.co/vovewotutal/aueiceJ/64432508897.pdfIn PDF document text
    • https://cdn.sqhk.co/lolajelor/vgcPlKL/top_open_world_games_for_android_offline.pdfIn PDF document text
    • http://wofurasosezisax.mywebcommunity.org/alice_s_adventures_in_wonderland_other_stories.pdfIn PDF document text
    • https://cdn.sqhk.co/vukixukafoga/M1vfheo/apostolic_faith_mission_membership_form.pdfIn PDF document text
    • http://xibomupazone.mypressonline.com/alcatel_3026x.pdfIn PDF document text
    • https://cdn.sqhk.co/lodikorep/2CFBIBh/slots_free_play_for_fun_casino.pdfIn PDF document text
    • https://cdn.sqhk.co/baxoladipezu/gxQibjc/sataxoviveti.pdfIn PDF document text
    • http://xibawolafubiz.getenjoyment.net/87729037086.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/78ef863a-42dd-4403-a678-69296d715677/jotobifudofatoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3f51cac-9a30-42ae-a123-c70bbbc51dde/lokumepurusigebemev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3643f89d-1da2-4370-916b-fa62fb77de7a/7147820919.pdfIn PDF document text
    • https://96daf755-36ed-4ece-a185-bed8db3f70ea.filesusr.com/ugd/a95cda_b4de2864941d4557b3c190a3094d10fb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce19844b-9c28-4297-8654-3626ab82f0ef/41880821717.pdfIn PDF document text
    • https://1ee34b3e-bfcb-4e25-b227-79ffd44eef10.filesusr.com/ugd/9d5096_2494759e28a04a41b23a81540b723aec.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/41dc69a0-974c-4905-9cbb-7e6b898da43e/juxerefowigovurixowasov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7d57241-c409-49dc-ae8c-482153658e90/how_much_does_100_army_disability_pay.pdfIn PDF document text
    • https://0e75ab8e-f6a1-4360-bef2-1d94e06fde4e.filesusr.com/ugd/c0518c_5449621ea315431daaf6935035f7c9cf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad4488c0-2217-4e35-8f16-f6578963363c/90749385740.pdfIn PDF document text
    • http://rojanesifilagu.myartsonline.com/89779695970.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdb1f4ca-b72f-4fb5-b202-ca498dcc4a22/twilight_2008_movie_download_in_moviesda.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_off00010b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B31 4916 bytes
SHA-256: 5645888391dc95c683be39fd4aaec4132c3c98a42a4f8f50ffab39519784aee8
font_01_sfnt_off00011bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDE 10340 bytes
SHA-256: 3bb19b0edd893d3fa5f4ec534c5442c0ad8d0b9383f9c68c6a2a96fd3cf78032
font_02_sfnt_off00013f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F2E 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e