Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fe621bb14002e24…

MALICIOUS

PDF

80.4 KB Created: 2021-03-16 13:13:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6b1eda92ca5229238b92e17b6a95b5d SHA-1: 347bc5da0b3db68813f9978bd62bdd14d865dcf7 SHA-256: 3fe621bb14002e24512f8e14d712c52b13789a906512bd0ae6bfa6f7be0316f6
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent link leading to a suspicious domain ('fokemale.ru') that appears to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or a scam. Although no scripts were extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=kenmore+elite+he5+dryer+won%2527t+start
    • https://cdn-cms.f-static.net/uploads/4425224/normal_6020895c21cb6.pdf
    • https://static.s123-cdn-static.com/uploads/4495860/normal_5feff9f14406b.pdf
    • https://meputaxuxiku.weebly.com/uploads/1/3/5/3/135304120/sukolanurosalakefuse.pdf
    • http://mon-cmso.best/drastic_ds_emulator_for_android_apkpure2g19u.pdf
    • http://wonder-ita.space/cuanto_es_un_metro_en_centimetroshatzo.pdf
    • https://static.s123-cdn-static.com/uploads/4454971/normal_5ff5339575299.pdf
    • https://cdn.sqhk.co/riketumes/j4hiieR/57193263315.pdf
    • http://becloud.website/66900645554x82gy.pdf
    • http://unityfree.xyz/293586583225yj8u.pdf
    • https://cdn.sqhk.co/rodosidebo/lOzhhrj/lifepefovewuk.pdf
    • https://cdn.sqhk.co/joxomawezu/jehdgND/itil_service_strategy_online_training.pdf
    • https://kasureketox.weebly.com/uploads/1/3/4/8/134856927/vozinidubizami_baluzakukude_fujofumevapozoj.pdf
    • https://static.s123-cdn-static.com/uploads/4404107/normal_5ff7759df1abc.pdf
    • https://cdn-cms.f-static.net/uploads/4496204/normal_60302b5c6580d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3a4e8294-58c9-4557-a764-3092161761f0/when_was_the_first_harry_potter_book_published_in_canada.pdf
    • https://uploads.strikinglycdn.com/files/916f63fa-21e5-460f-824d-842b3a069262/lg_exalt_2_sim_card.pdf
    • https://uploads.strikinglycdn.com/files/ce29ecf9-e3c0-4922-82c9-52c77835ed65/memefenitogujepapil.pdf
    • https://uploads.strikinglycdn.com/files/3080b037-574d-4ab2-962a-4f70e657d98e/sumitexotivedezikov.pdf
    • https://uploads.strikinglycdn.com/files/2b12e7f6-866b-4dc0-b9fc-ee95ab1f7006/79380177781.pdf
    • https://uploads.strikinglycdn.com/files/344d4b3c-77cf-415c-b483-9a35d13194c6/montre_casio_g-shock_ga-100b-7aer.pdf
    • https://uploads.strikinglycdn.com/files/b6eb611e-b953-45f0-b97f-bc18a5a9bf41/tusozesidodod.pdf
    • https://uploads.strikinglycdn.com/files/b723970c-f3de-4521-be99-49f08e3c496c/tegomuvawerubaxakin.pdf
    • https://uploads.strikinglycdn.com/files/acf8ecc9-47a3-40fc-bfb0-fdbeaa013bf7/widemekamitapu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8f0.bin
f79fe6dbc3bdc04994ad7f48871e1bf1e3ffa7f7f41d57cb48f7fb897e0d9a16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F0 5384 bytes
font_01_sfnt_off00010b34.bin
24334bd8f9ebfe9ad79d83c4269b5c78bf13ef996c1797fd1251fe9ac24a6e9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B34 12100 bytes

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