Malicious PDF — malware analysis report

Static analysis result for SHA-256 f033dc3e5a086065…

MALICIOUS

PDF

85.3 KB Created: 2021-03-29 17:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 81eccef2d04ff93d6c6df53b89713359 SHA-1: 2ad0bd9137bb581e80509d88c935d9a2df50f5a1 SHA-256: f033dc3e5a086065cadad145431d7ff709370a0e22b22c04b080ecb24b55f320
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URL and the nature of the links suggest a phishing or redirection attack, likely aiming to deliver a second-stage payload or lead users to fraudulent content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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://resalured.ru/award?keyword=web+application+architecture+principles+protocols+and+practices+pdf+download PDF link annotation
    • https://cdn.sqhk.co/wixefawoz/imAZWjg/army_criminals_transport_ship_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/muribirigim/uihogeZ/pifonudapijowa.pdfIn PDF document text
    • https://cdn.sqhk.co/letinumi/guiheNt/42777803499.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/56c7a31f-555f-4b3d-b6fd-f3fd65500bb9/zojuse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d86ef7ef-edf4-4e79-9e21-c5fbebdbde12/patunegamagipok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3791dd3a-7100-4f76-92b2-702f26930567/41031490038.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d85f831e-7e64-4e14-93e4-d79582c3e06a/dodun.pdfIn PDF document text
    • http://nemebikox.epizy.com/deadlift_form_video_bodybuilding.pdfIn PDF document text
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_08a5fb10c7444e4e89bc257f0d0caa8f.pdf?index=trueIn PDF document text
    • http://gorefoverotiw.epizy.com/vagevuvebogapuva.pdfIn PDF document text
    • http://nufudojor.epizy.com/kaduwutewad.pdfIn PDF document text
    • http://kutubuge.rf.gd/mla_citation_format_for_file.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e9938c5-ec0a-42e1-98cd-c8f4a9492301/how_do_you_program_a_uniden_bearcat_scanner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b1d932d-9a74-498e-ad8c-965bcc1e1109/mudiwosilejerolijozav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c00934f9-d4c5-4769-b8cb-be79e9d09b91/what_are_some_interventions_for_anxiety.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/038ce252-c56c-4543-be64-95a613c7176f/factory_reset_dlink_dir-890l.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23f57e86-b410-493b-8201-7c6ae73e8cef/how_to_evaluate_taylor_series.pdfIn PDF document text
    • https://7be326e9-a1fd-4761-a84c-83c904220737.filesusr.com/ugd/37e945_8c7c62fc3c5c47bc8d8276d3b2c2feae.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b4b6b42-0a7d-47f1-b850-5a218edb36c1/12414581247.pdfIn PDF document text
    • http://fizetoxeloxiti.rf.gd/69262158172.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe4cfe78-a34c-4808-bb44-99dd19fb4157/jogedinarenimalelewifig.pdfIn PDF document text
    • https://cef8af8d-7071-4339-ac50-fc417d371010.filesusr.com/ugd/a89196_284e6988eb3d42fb950c91783294ac4b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4700e311-9524-4a46-8f9a-f786d3eac063/is_11_22_63_going_to_be_a_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d92b67c4-2fb7-42ae-8283-8969cb3f86ce/44340493404.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93744acf-a2d1-4240-beb9-e77de0b9d85d/nigogomogikojuzosixejig.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_off00010de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE8 5488 bytes
SHA-256: edd72d6e1122d49d27288a92a15bd09d09a2dbe39a8c8c2f19f9a3441dd3df6f
font_01_sfnt_off0001209d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209D 11392 bytes
SHA-256: 21743124bb7a61838c8afc7044b03b6b39318e9dac62fabab7e99d8ce8372d45