Malicious PDF — malware analysis report

Static analysis result for SHA-256 87e6ffd77ee865a4…

MALICIOUS

PDF

80.2 KB Created: 2021-03-23 19:12:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 174bbe362c84b5545b731f61caf95db3 SHA-1: da06ee9d9aa1d8b97d2348962c66159ba9a63e5b SHA-256: 87e6ffd77ee865a438963e456a43a36961095d6f035bb31d004fda13ef36ddf0
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, indicating a link farm or phishing attempt, as suggested by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly indicate maliciousness. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document, likely used for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/strik?utm_term=what+do+you+call+a+woman+who+husband+has+died PDF link annotation
    • https://cdn.sqhk.co/kibukumivu/heYMidQ/papiki.pdfIn PDF document text
    • http://servisvds.ru/download_fe_reference_handbook_9.5bvw2u.pdfIn PDF document text
    • http://lnstagramcopyrighthelps.com/2005_john_deere_hpx_gator_specsf2ngb.pdfIn PDF document text
    • https://cdn.sqhk.co/jufenakajo/fhaChdF/napeweranaja.pdfIn PDF document text
    • https://vosaxiwajikox.weebly.com/uploads/1/3/0/9/130969878/fizizobori.pdfIn PDF document text
    • https://cdn.sqhk.co/jiwosowo/6jbS3wW/oil_price_live_app.pdfIn PDF document text
    • https://cdn.sqhk.co/kobewudojuvo/fibgheg/more_fish_mod_1._14._4.pdfIn PDF document text
    • http://tibudirowe.mygamesonline.org/xufewusoleda.pdfIn PDF document text
    • https://jitezawedum.weebly.com/uploads/1/3/4/6/134688152/c6c28067f288.pdfIn PDF document text
    • http://gazzsheff.xyz/tifomagigextelj.pdfIn PDF document text
    • http://larebalin.mypressonline.com/is_tcl_better_than_insignia.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/a6aa9cbb-3121-41de-9301-afacf67b989f/sumaboxikorupuwugixonuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4208b435-dc98-4a9f-a156-61795bfd61a1/gran_turismo_6_ps3_cheats_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/invent_your_own_computer_games_with_python_4th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4407db5-adc7-4b9d-b325-f24025275287/jevodesopufilarugolebobi.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/rijowadadar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d739f4c-8fe8-4299-af8b-d4044f6d8a66/loxorus.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/how_to_make_skinny_guy_build_muscle.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_off0000ec0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0F 5312 bytes
SHA-256: beca5a10dd0b9c4cec57afa64db62bf9721a35e4660e5977012d5476b99898fd
font_01_sfnt_off0000fe18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE18 10976 bytes
SHA-256: a8eb52e8b3455058ae744b12c998031df955eb526da071a2180649dcce1e67e9
font_02_sfnt_off00012336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12336 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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