Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce4a05b8bf19891f…

MALICIOUS

PDF

83.1 KB Created: 2021-04-16 20:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab4a4ba013fb6f60866d397987a5dd1d SHA-1: 9dda8af51259556f4e8a51323c1c277602453d58 SHA-256: ce4a05b8bf19891fe826d0bac00517a2da3e3437566fe171f1333246b54e20f3
126 Risk Score

Malware Insights

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

The PDF file contains multiple external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing lure or a downloader for further payloads. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a common phishing or malware distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://zajinet.ru/strik?utm_term=equivalencias+neum%25C3%25A1ticos+de+pulgadas+a+mil%25C3%25ADmetros
    • https://kopezufotixese.weebly.com/uploads/1/3/1/1/131164020/veletejerugumefuror.pdf
    • http://fafijitesulexiz.mygamesonline.org/bncc_2020_baixar.pdf
    • https://pizazolumugi.weebly.com/uploads/1/3/4/0/134016987/pepakujuzovoralokog.pdf
    • http://mediaverifiedbadge.com/what_is_the_best_nemesis_monster_in_monster_legendscdfvz.pdf
    • http://fbcopyright-center.com/graphic_design_software_online_free1dkci.pdf
    • http://milktree.store/how_to_organize_bookshelvesnl8wa.pdf
    • https://vekibapovadivoz.weebly.com/uploads/1/3/0/8/130873848/suwudeture.pdf
    • https://teraxamexad.weebly.com/uploads/1/3/1/3/131380600/zelinudabiniwexutufi.pdf
    • http://tujemet.scienceontheweb.net/how_to_install_wolf_microwave_trim_kit.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/posaxugidut/best_ghanaian_worship_songs.pdf
    • http://pumonufagatoteb.epizy.com/bounce_fabric_sheets_and_mice.pdf
    • https://s3.amazonaws.com/pazovugal/mumerub.pdf
    • https://uploads.strikinglycdn.com/files/99f84781-3bce-4d59-8f5b-8ec7c4553f45/angle_worksheets_for_grade_4.pdf
    • https://uploads.strikinglycdn.com/files/4a058d63-29a4-4209-aa01-db6f9d97637d/magubizabirozonaxuwepev.pdf
    • https://uploads.strikinglycdn.com/files/2970effd-1e08-4066-9dc8-e1e46b552ca9/how_much_does_windows_movie_maker_2020_cost.pdf
    • https://uploads.strikinglycdn.com/files/68d24166-1110-48c0-a353-b78aeb690c1c/onkyo_tx_nr616_review.pdf
    • https://s3.amazonaws.com/mivokozibu/granny_smith_full_game_apk.pdf
    • http://woxikajir.myartsonline.com/rental_application_form_fillable.pdf
    • https://uploads.strikinglycdn.com/files/92823bb0-5228-4c50-9aaf-673a46418b69/75270334590.pdf
    • https://s3.amazonaws.com/tobito/introducing_yourself_to_coworkers_via_email_template.pdf
    • http://naxefugoxodikow.atwebpages.com/pegusufasiremibutata.pdf
    • http://wokoxut.epizy.com/all_the_evil_of_this_world.pdf
    • http://situwosase.myartsonline.com/kibiribawomufuk.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f387.bin
10d4ecca3ac477ac6e0c66a2dd60663911ddba89be42db50df01d213c48c4982		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF387 5708 bytes
font_01_sfnt_off00010647.bin
59103cd9b00cdd30bf840aa123bf902641c897e81c97c47fa2b6e9dfdd9c6e91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10647 12076 bytes
font_02_sfnt_off00012dd9.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD9 4324 bytes

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