Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f5a85158f0d6d9…

MALICIOUS

PDF

85.4 KB Created: 2021-03-30 17:14:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 79f34a83f1d9c8e09dcf2b2149d8b27a SHA-1: d208eb4f5d18356d55617b484788488f02bc3e66 SHA-256: f5f5a85158f0d6d9596e314bf4134482cc56ada60207bbb22950ff059d7fb2c3
156 Risk Score

Malware Insights

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

This PDF contains numerous external links, with a significant heuristic firing indicating a 'PDF_SEO_LINK_FARM'. The primary external URL identified is 'https://xezojetit.ru/award?keyword=punctuation+marks+test+pdf', suggesting a tactic to manipulate search engine results or direct users to potentially malicious content. ClamAV also detected this as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/award?keyword=punctuation+marks+test+pdf
    • https://galezarulunozip.weebly.com/uploads/1/3/4/8/134896955/lapidanaxagiwiwigi.pdf
    • http://allwoman.site/is_camilla_in_season_45esph.pdf
    • http://gazzsheff.xyz/bike_computer_your_personal_gps_cycling_trackerw0vu7.pdf
    • https://povazolanatul.weebly.com/uploads/1/3/0/7/130740072/kosijewijeto-lepilav-madolapakiretu-mukuratefiziri.pdf
    • http://greatmasters.biz/is_adobe_acrobat_9_pro_still_supportedeas56.pdf
    • https://fozaxuvuten.weebly.com/uploads/1/3/3/9/133986835/5dd920f.pdf
    • https://fazugiwe.weebly.com/uploads/1/3/4/0/134012697/welokuvapodu.pdf
    • http://experiment.website/75203615710nvsej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7f3dc8b3-869c-44c5-82eb-14ae88d57796.filesusr.com/ugd/dc4ca1_f4e4df5dbb454052b85c43b08df117a8.pdf?index=true
    • https://4de1274e-a26b-4e71-a0d1-d86f0cfee7ee.filesusr.com/ugd/ee4d88_e220ddc400834f3bb6d839fde86072ae.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7ee67fe7-5435-4dda-b001-8ecd70458d65/how_to_replace_battery_in_blueparrott.pdf
    • https://s3.amazonaws.com/gosete/europa_report_movie_watch_online_free.pdf
    • https://s3.amazonaws.com/zikeko/thank_you_very_much_in_italian_formal.pdf
    • https://s3.amazonaws.com/duzexefemosaxe/16500520664.pdf
    • https://uploads.strikinglycdn.com/files/b2146502-98b0-4742-aae6-5b87365ced7d/14264597681.pdf
    • https://uploads.strikinglycdn.com/files/fd4482ab-c959-41c3-8368-84616be9b106/how_to_write_poems_easy.pdf
    • https://s3.amazonaws.com/susonanezaj/bal_hanuman_pictures_free.pdf
    • https://s3.amazonaws.com/jijumupade/abstract_reasoning_tips.pdf
    • https://uploads.strikinglycdn.com/files/2ddd95b9-84af-41ac-acee-3e897eee344b/how_to_find_distance_and_displacement_on_a_position_time_graph.pdf
    • https://47e244ab-6b1f-4ae7-97e8-86de5b619f9f.filesusr.com/ugd/e1d12c_11a68927bfa1406f8dc2704044c56895.pdf?index=true
    • https://s3.amazonaws.com/ruzumeb/lofixufurepavovuvosapo.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_off00010f17.bin
3be78126ed6b0b75063550608feba79a930815987e82d526322a264306bc4b11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F17 5332 bytes
font_01_sfnt_off00012125.bin
7e3c5ae89e0e34dc53bbbe5f3e17234a60aca31bc4cdfa58cb82050b95d287e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12125 11496 bytes

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