Malicious PDF — malware analysis report

Static analysis result for SHA-256 85455f163970eaa7…

MALICIOUS

PDF

79.6 KB Created: 2021-04-07 04:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 7f6e3488c0024b1c413af61d90606755 SHA-1: 7e2286d3da06205c191f9e57aadac1c36377f78f SHA-256: 85455f163970eaa72d6b8682363b175ab014772807758395b9b57ca1f49a4e2e
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'fokemale.ru', which is flagged as a potential phishing or malware distribution site. The document body, though heavily obfuscated, contains text that suggests it is masquerading as a book, likely to trick users into clicking the malicious link.

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://fokemale.ru/strik?utm_term=for+men+only+book PDF link annotation
    • http://zavodtriumf.com/how_to_put_music_on_nano_ipodokq6y.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutorixo/VrQQwJr/89892910508.pdfIn PDF document text
    • https://cdn.sqhk.co/dijogiper/gmghidJ/fumuwugilom.pdfIn PDF document text
    • http://triple-doska3.club/p-_touch_address_book_software7hi2b.pdfIn PDF document text
    • https://cdn.sqhk.co/bogovureg/bijFijH/nos_street_racing.pdfIn PDF document text
    • http://legko.travel/dagurirujipurotov5ee2f.pdfIn PDF document text
    • https://cdn.sqhk.co/butemobe/migjihg/choice_of_the_vampire_2.pdfIn PDF document text
    • http://tafiwon.mywebcommunity.org/types_of_angles_in_parallel_lines_worksheet.pdfIn PDF document text
    • http://cabinetshq.xyz/19723632367zxzqx.pdfIn PDF document text
    • https://cdn.sqhk.co/zefafulolit/ygeZjf7/74858447599.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zonebon/50_verbos_irregulares_en_pasado_simple_en_ingles_y_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27c7267b-24d9-4f31-9cf3-01a2293bf1f7/chakra_books_nz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c029edf9-3838-411a-b5aa-8fe717f571c4/64278160202.pdfIn PDF document text
    • http://rivetibixonapaz.myartsonline.com/zoo_animals_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19f44105-e90a-435f-a7f7-3a36c24301fd/age_of_heroes_hesiod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78a9434a-d7f3-4d62-b43c-5aeffaacf987/85671078509.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65a08249-393c-4e77-9b8b-353a7e02164c/kunuris.pdfIn PDF document text
    • https://s3.amazonaws.com/jotogorurekuro/grammar_worksheets_5th_grade.pdfIn PDF document text
    • http://lavapokapajemob.myartsonline.com/free_paraphrasing_worksheets_for_middle_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b90d200-8166-40d9-9c28-647c77af45d7/92_squadron_battle_of_britain_pilots.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fccba64-9ddc-464a-b7d1-4742371f078c/how_to_change_toro_recycler_22_blade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba7bd3ac-b611-4aae-8500-03e20f50e5e4/buwogebasudosuvaja.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_off0000f762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF762 4704 bytes
SHA-256: 7ff6a46a1e9f98c7d6fcd26cbc6b056fcd9cdb4e6757a8ddd4c3d1567c1ea462
font_01_sfnt_off0001075e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075E 12860 bytes
SHA-256: a446d521b81f2a928d37161d066faba2ff289e0374a486d910ea58c7e03384a4

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