Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f2072ee23622d0…

MALICIOUS

PDF

77.9 KB Created: 2021-06-07 01:33:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7ebaed56d9077f2ab0b426a3c4ea49ea SHA-1: 71763f65ba1ce723cca92e79300ec91227d9c9e1 SHA-256: b8f2072ee23622d0062f5731ffb6215589f872d4b47df0081d4c2b413cc3385c
226 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://xajibur.ru/123?utm_term=commandos+3+full PDF link annotation
    • https://nidatufibamukun.weebly.com/uploads/1/3/4/1/134131265/440731.pdfIn PDF document text
    • https://vudemigubujesi.weebly.com/uploads/1/3/5/3/135300151/pagap.pdfIn PDF document text
    • https://dajapofijakaf.weebly.com/uploads/1/3/4/2/134266914/vowusevivo-movazotobev-vamolijabumer-xalipo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387817/normal_6034e23aad567.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380694/normal_6052e565db3b1.pdfIn PDF document text
    • https://zozumaled.weebly.com/uploads/1/3/1/3/131379894/c28f582a96776.pdfIn PDF document text
    • https://pizizidoto.weebly.com/uploads/1/3/0/8/130873839/ad05912bb5a77cb.pdfIn PDF document text
    • https://lipuguxe.weebly.com/uploads/1/3/0/7/130738524/xigabaz.pdfIn PDF document text
    • https://jikumuwalomaj.weebly.com/uploads/1/3/1/3/131383204/ripozeriropexefomu.pdfIn PDF document text
    • https://pobikutilun.weebly.com/uploads/1/3/4/8/134871216/1993959.pdfIn PDF document text
    • https://sadibagisu.weebly.com/uploads/1/3/4/7/134758630/8599335.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4421468/normal_60b50bbf1e9f0.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/0ead8a8e-0af8-492f-93c4-b206d5cbb2f6/all_star_wars_races_with_pictures.pdfIn PDF document text
    • http://binovilijire.pbworks.com/w/file/fetch/144708372/vw_golf__vento_haynes_service_and_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28dbe0f1-c8c8-48fe-ac4d-035bee75f1a8/wowafobojukuvufu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97d08a1e-d3fa-41db-abfb-4089d82d8f55/34384451939.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45ecf068-6fa2-48c8-8270-eed201aab406/the_fire_sermon_traduzione.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32f157a4-5c9d-4898-9e51-f045191b628f/charlie_munger_portfolio_concentration.pdfIn PDF document text
    • http://betosaxugawi.pbworks.com/f/37623466129.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9fd0041-7afd-41d2-a0cd-0c3990cb6b8f/ram_dass_guided_meditation_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8684e472-0ea0-4511-9573-5d1a3c081eec/vatifimurijilaribov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ed6c0d9-9395-4d68-aee9-9a5b938443bc/autohotkey_mouse_click_script_download.pdfIn PDF document text
    • http://funuvutidip.pbworks.com/w/file/fetch/144612021/restorative_yoga_poses_for_manipura_chakra.pdfIn PDF document text
    • http://puzavofan.pbworks.com/f/battle_rope_workout_routine.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_off0000f0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F9 5028 bytes
SHA-256: c7e9135dcdd49ee68c788241650864ce0b5a5dac950431e42f7b2600375f1882
font_01_sfnt_off00010200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10200 11900 bytes
SHA-256: d39d7f0902d2d13b0cf46a753e4054a9eda8b89397314d0dc277b81997968502