Malicious PDF — malware analysis report

Static analysis result for SHA-256 40eb63509e9575e7…

MALICIOUS

PDF

75.2 KB Created: 2021-03-27 10:43:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0175ad7c6533d45d101c0de3d5b1ad66 SHA-1: 78a87792b296fbb050de5944cde7b88f04b9bb6a SHA-256: 40eb63509e9575e79a132288c9b8c04db91096cfcb629118be1589ef70215425
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with many pointing to disposable domains and flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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/wix?keyword=pinoy+ako+bamboo PDF link annotation
    • http://xegazufagabapo.22web.org/toxolavajifededosu.pdfIn PDF document text
    • http://bluebadge-support.com/3295251646248ssl.pdfIn PDF document text
    • http://rbqjkwklnd.xyz/4092651720l3byx.pdfIn PDF document text
    • https://cdn.sqhk.co/jotepomi/sphcahg/online_store_business_plan_template_free.pdfIn PDF document text
    • http://carbags.site/pabulofizovebokusi71dt2.pdfIn PDF document text
    • http://cheapkeys.site/pharmacognosy_ck_kokate_freefkt6w.pdfIn PDF document text
    • http://distornyup.site/tamubaxplbiv.pdfIn PDF document text
    • http://myfirstsite.xyz/small_engine_repair_books_for_sale84xam.pdfIn PDF document text
    • http://mailedflkf.site/a_well_educated_mind_quotes5u4vp.pdfIn PDF document text
    • https://cdn.sqhk.co/sirezozere/zSjihde/konegatawogixenezon.pdfIn PDF document text
    • http://guitar.su/nanitezerapadexujibelawo3zu5h.pdfIn PDF document text
    • https://cdn.sqhk.co/tavikagisato/rhgbo5v/tigexorudenijutu.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/1fbbd664-74dd-4fa4-9f47-9e53dbe27326/tosax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9af1ace1-908c-43f2-bac9-f2bc1c06cc0a/english_grammar_fourth_edition_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db1beba1-e2ee-41a1-95e4-42fc9ee2f00a/is_randomness_really_random.pdfIn PDF document text
    • http://dizibabazuvuxu.rf.gd/academic_poster_template_publisher.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2149e4e6-3ada-4178-a1ff-f83ad053ecf2/47248357148.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f94417c2-167b-4391-94b1-3b3601b486e4/casio_illuminator_watch_gold_womens.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0d56eae-c8cc-4000-8f81-8863d61006a3/kazofuvamulosinotefa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad2ffa47-f9da-4167-949f-3e9aac094859/66289528410.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cf3c03d-ec91-4bba-8937-23627a7e80e4/how_to_fix_bissell_vacuum.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_off0000db69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB69 4420 bytes
SHA-256: 50fa4b57e241fc20e265eba3125b40504297150996c3e4f203affde4c437ba09
font_01_sfnt_off0000ea46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA46 11512 bytes
SHA-256: e439e8f01b2a4befa80b4a36edd43f4bebed10fa8f94f59c97b087c1de87b5a4
font_02_sfnt_off0001112d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112D 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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