Malicious PDF — malware analysis report

Static analysis result for SHA-256 af38441d1fd81500…

MALICIOUS

PDF

79.1 KB Created: 2021-02-26 13:41:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: f31e4cf5e17c4f1270f42510e5b4ee20 SHA-1: 2f41419274f64849cf37a231ad2f8f6fdf626908 SHA-256: af38441d1fd81500454c4384c496b6266f18d81e4fce5b3bf5ff279296b62d31
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to a suspicious domain ('dugedepap.ru') and another to a disposable hosting service ('rubewox.sportsontheweb.net'). The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the overall structure suggests a link farm designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dugedepap.ru/wb?keyword=can%20i%20use%20a%20regular%20memory%20card%20for%20ps%20vita PDF link annotation
    • http://rubewox.sportsontheweb.net/lorinufuwe.pdfIn PDF document text
    • https://cdn.sqhk.co/fodexuxefeba/czgjjja/define_strategic_thinking_in_education.pdfIn PDF document text
    • http://lozomaneje.getenjoyment.net/the_wave_book_vs_movie.pdfIn PDF document text
    • https://zamovolipizutuj.weebly.com/uploads/1/3/1/0/131070940/gupexufe_pufulamava.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479675/normal_602902dd66df0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444377/normal_5fd66e32758b9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469638/normal_60091fc805fb5.pdfIn PDF document text
    • https://cdn.sqhk.co/tisojubew/dL8Njgj/battle_angel_alita_ova_download.pdfIn PDF document text
    • https://nisudine.weebly.com/uploads/1/3/1/4/131454656/fawemonujemegu.pdfIn PDF document text
    • https://lipuxavevafip.weebly.com/uploads/1/3/1/3/131398459/9077317.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425737/normal_5fd0df1c3e391.pdfIn PDF document text
    • https://daliroxemonove.weebly.com/uploads/1/3/0/7/130775241/2746977.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489240/normal_60183b6014db8.pdfIn PDF document text
    • http://junumidutuzakox.getenjoyment.net/16715488439.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/ximupuv/dologemezazu.pdfIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/logokemiminegovixew.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/nupim.pdfIn PDF document text
    • http://zizizototumat.rf.gd/john_deere_l100_deck_belt_replacement.pdfIn PDF document text
    • https://s3.amazonaws.com/wixatax/materi_akuntansi_sektor_publik.pdfIn PDF document text
    • http://zemoxatovasoga.rf.gd/android_tv_box_mini_keyboard_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/volkswagen_beetle_transmission_fluid_flush.pdfIn PDF document text
    • http://xobabikek.rf.gd/application_letter_format_sample.pdfIn PDF document text
    • http://sofidubanelen.epizy.com/91809630490.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_off0000f747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF747 5540 bytes
SHA-256: 8472a0bc9116bf662e255c7d76b8b832edae1a237491e8f4b061367728f3cac6
font_01_sfnt_off00010a1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1E 10700 bytes
SHA-256: b06a751c38185489cfca8f8dde1c9a41794b793fb5beb68292268f98a9a0eda1

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