Malicious PDF — malware analysis report

Static analysis result for SHA-256 10350239bb43843b…

MALICIOUS

PDF

100.0 KB Created: 2021-04-10 05:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 049fb7c24b26fc07a30f7688f144a1f6 SHA-1: cd5e241b6001a9b53308f7b31b1fd82bead5fb8d SHA-256: 10350239bb43843ba9c005936e2ae352938d17a132be4dd7267702c06673dc38
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Numerous embedded URLs were found, many pointing to disposable domains and employing UTM parameters, suggesting a phishing or link-farming scheme. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically highlights the nature of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pelibifir.ru/strik?utm_term=a+court+of+wings+and+ruin+audiobook+vk PDF link annotation
    • http://saveyoutubebot.com/is_frost_nixon_on_netflix5hfxs.pdfIn PDF document text
    • http://cafe-cok.ru/alvitec_informatica_so_carlos_spko5ui.pdfIn PDF document text
    • http://doordash.link/cyrano_de_bergerac_movie_quotesj2t7y.pdfIn PDF document text
    • http://bamovewube.22web.org/munchkin_rules_death.pdfIn PDF document text
    • http://onkoprofi.ru/25267546827pdhu7.pdfIn PDF document text
    • http://pusokum.66ghz.com/78642736131.pdfIn PDF document text
    • http://pobasomitiji.22web.org/how_to_search_browser_history_by_date.pdfIn PDF document text
    • http://afracheat2.xyz/fosuvixirixapotulufunof6c5s8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/234b4f55-be53-4b2c-a0da-94a8e152a4d8/14592944379.pdfIn PDF document text
    • http://vobafuge.epizy.com/how_to_study_civil_engineering.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8001074a-addc-4a5e-b5bb-c1bc1fcbb125/dusosekakojuzu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/195140fc-d7a4-4c8c-9386-d8ca12d1e6d1/9973849235.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/menuxaxutebetikepegapopuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/415ed7fe-ee62-4196-8eed-1bf6c14acc84/37983732235.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6acc26eb-677c-4100-94f9-2d043c7b9187/popular_childrens_fairy_tales_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb756bd5-2033-4045-8226-88195fa8608c/zitoxip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f8d5ae9-a02a-4930-ae36-e820f20791cb/ipod_touch_6_update_to_ios_13.pdfIn PDF document text
    • http://luxetejafolakem.rf.gd/dwarf_fortress_adventure_mode_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/301194ed-aa08-49fc-95ea-5e03abd90ddb/toro_power_clear_518_ze_starting_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/firede.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef96743c-04db-44cb-aff1-ec273ee5da81/modureselumarelev.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/redusofedebuketakogubop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2355a622-4faf-47fc-9f3e-5fd06d6b1947/kubodefomisonijig.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000127aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AA 5500 bytes
SHA-256: 506517204a5bb84804be7c2d7feb07a71192be169346a07b4eb3bf5ffcfd14c5
font_01_sfnt_off00013a92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A92 16156 bytes
SHA-256: 61ff9959f80f4d334ccfaea3c176dca03778c1ad6750763eddd907d24efc38fe
font_02_sfnt_off00016c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C84 16252 bytes
SHA-256: 67f1402fc770df3e803a17dfb7bd48f894e3e875afb4579df3ab1cc4313e2602