Malicious PDF — malware analysis report

Static analysis result for SHA-256 8641968299fa1af7…

MALICIOUS

PDF

75.5 KB Created: 2021-03-25 02:20:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 87564578b0047fa8ae317115b245ba0a SHA-1: eb21b68935ac54e403f331e12e8c339088544dea SHA-256: 8641968299fa1af7132743b8e14a400771a8140b95a3fa957f31abacc6b2b298
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The embedded URLs likely serve to redirect users to malicious sites or download further payloads, aligning with techniques used for initial access and exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/strik?utm_term=2013+dodge+avenger+3.6+oil+filter+housing PDF link annotation
    • https://cdn.sqhk.co/lexaxemiji/Piciahg/ed_sheeran_happier_lyrics_video_download.pdfIn PDF document text
    • https://cdn.sqhk.co/timafewa/TigdwfT/suntze_art_of_war_narration_app_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405193/normal_6014d935cff10.pdfIn PDF document text
    • https://cdn.sqhk.co/buwowunuras/hjFDLjf/gexutejewubora.pdfIn PDF document text
    • http://fofakowusagafo.22web.org/gerakufujigujifeninukimeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458407/normal_60370d0640296.pdfIn PDF document text
    • https://cdn.sqhk.co/pogadidotilu/ic2DhaN/hundred_fires_3_sneak_action_mod_apk.pdfIn PDF document text
    • http://godumos.22web.org/remozadijav.pdfIn PDF document text
    • http://pusikoxelumide.iblogger.org/40698466850.pdfIn PDF document text
    • https://cdn.sqhk.co/narulaloro/Lijhghh/vixogititir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421770/normal_6054ce0aa8023.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://geduzesibasax.epizy.com/feruzikusazakuzetuta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/265ba4a1-e798-4895-b012-aada7daaf057/megetogufaronogudad.pdfIn PDF document text
    • https://bebfd8c0-80ce-41fe-bfeb-d90376b9945e.filesusr.com/ugd/b0b521_1fcdc948d3b9465c8a1993f096e2ab48.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc0ee10d-9cbf-49ed-9db2-4ae32c72e323/fluke_network_dtx-1800_cable_analyzer_software.pdfIn PDF document text
    • https://f4b9ed98-44c1-44e6-9966-d9817cd43de7.filesusr.com/ugd/9ced5d_18fc0501241549e4ba9320451f8480db.pdf?index=trueIn PDF document text
    • https://cd70d4e5-4a1a-4071-96d1-f2415ea5ece1.filesusr.com/ugd/7f46b5_083a010cc862443187d799d0fe359132.pdf?index=trueIn PDF document text
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_fc9f3044e0b44298b481ea8cbe39218f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/55faf0ce-2631-4574-819d-cad36fd87d96/do_exercises_help_scoliosis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6ba2cb3-ff4e-4634-aea6-24eb49edbb3d/the_devil_will_find_work_for_idle_hands_to_do_smiths.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8333307-8d57-4327-9ede-0f6024dc53d8/how_much_is_used_samsung_s9_in_nigeria.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_off0000e76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76C 5812 bytes
SHA-256: 037e113f339ef1a4498fc50087f2e9bca1fd8e8c184f2288977912bde6a2c081
font_01_sfnt_off0000fb40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB40 11068 bytes
SHA-256: ebba2970278989bd76df44dee2d5eca82b83be788ba62ac7c2a2ece4283f8c05