Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a353eb6381c1e46…

MALICIOUS

PDF

75.4 KB Created: 2021-03-05 19:23:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: a4bf98c7e5714e918089267739d0753c SHA-1: 40b44c92ae9da5b9fe78845e588d5bd82bec03b1 SHA-256: 8a353eb6381c1e46b5ab6178217553a640453b61303264f176d68e5b8ebd4263
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with one specifically identified as an external URI pointing to 'https://zajinet.ru/wix?keyword=bts+rose+bowl+2020+sold+out'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, suggesting a malicious intent for SEO manipulation or redirection. No scripts were extracted, but the presence of multiple external links and the ML classifier's high confidence score support a malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://zajinet.ru/wix?keyword=bts+rose+bowl+2020+sold+out PDF link annotation
    • http://wavesubikuviv.iblogger.org/vudav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495387/normal_5fdc7bc56d43f.pdfIn PDF document text
    • https://cdn.sqhk.co/febenapox/jgia1jj/best_rechargeable_hearing_aids_on_the_market.pdfIn PDF document text
    • https://nutakiderovex.weebly.com/uploads/1/3/4/6/134622867/6ed79e3.pdfIn PDF document text
    • https://sanokigoj.weebly.com/uploads/1/3/4/8/134863934/xomejomukive-jodukimamejosek-jezumasubitise-nukojawesu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446784/normal_602d058848848.pdfIn PDF document text
    • https://cdn.sqhk.co/gesokusa/IjaO8hi/stack_fall_ball.pdfIn PDF document text
    • https://tirugisig.weebly.com/uploads/1/3/0/7/130738706/1150097.pdfIn PDF document text
    • https://cdn.sqhk.co/zanaforare/hfgcgcv/unmount_external_hard_drive_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/rapawaferew/igDjadm/dirty_memes_for_snapchat_stickers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452861/normal_5fdd3a5b3a141.pdfIn PDF document text
    • https://wugepazi.weebly.com/uploads/1/3/4/3/134348030/ed6f51ef3f1af3.pdfIn PDF document text
    • https://lapadodipelij.weebly.com/uploads/1/3/1/1/131164402/5710908.pdfIn PDF document text
    • https://wisakonison.weebly.com/uploads/1/3/4/7/134766038/617feaa35093df.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://raxexirep.epizy.com/black_and_decker_food_processor_shredder_blade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6967a440-37a6-4826-aacd-30443ec0ad4e/sibar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/295ad637-d3fc-417a-b246-57762ff002cc/48042717799.pdfIn PDF document text
    • http://tonezifimoraga.epizy.com/abbaigaru_audio_songs_ing_come.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c654c3bb-b1b4-47b2-92a5-1e17efbedea0/bose_wave_cd_wont_play.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70c6448a-6210-46a7-817a-f1a444070139/tcl_32_inch_roku_tv_1080p_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5184b12-d9ef-4c96-b612-e0abcc583cda/how_to_fix_resolution_on_mac.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_off0000ea3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3A 5164 bytes
SHA-256: 58fb4b82a8ef6933ddd4d1ce6ca32e92c529863a136bd8d814df1a81d8f160b1
font_01_sfnt_off0000fbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF3 10592 bytes
SHA-256: 24765fb9410003006545f020460624f0e0d944267be2e7a911a3f0da3a0a87e3

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