Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3eb6b37bfbecdbe…

MALICIOUS

PDF

107.3 KB Created: 2021-04-29 05:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 87e9970f6c713ed52e955f89d67a79bc SHA-1: d03268f7cfba0b557a49bbf9dfbbc0664ee132d2 SHA-256: a3eb6b37bfbecdbe179f602d4ce4e883b042bd51f0b488ec00203854b60b5e53
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO abuse. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://jacksth.ru/strik?utm_term=what+should+a+lab+report+introduction+include PDF link annotation
    • https://cdn.sqhk.co/pokemazikera/lbrUmPs/bibiluvefizosususom.pdfIn PDF document text
    • http://eglo.club/zukaludoniduvadifelozeonz47.pdfIn PDF document text
    • http://kamini33.ru/gods_of_romeukw07.pdfIn PDF document text
    • http://gallery-shop.site/cheats_de_chrono_trigger_snes_espaol5qvje.pdfIn PDF document text
    • https://wudigunufite.weebly.com/uploads/1/3/4/6/134611509/923714.pdfIn PDF document text
    • https://sexomimafu.weebly.com/uploads/1/3/4/3/134311134/5942027.pdfIn PDF document text
    • http://lawyer-consult.ru/29040802549yqz4l.pdfIn PDF document text
    • http://kind-insta.site/android_games_convert_to_pc_freerqha3.pdfIn PDF document text
    • https://cdn.sqhk.co/faserekino/wsiiGhg/11547499225.pdfIn PDF document text
    • https://zoveponezewuda.weebly.com/uploads/1/3/0/7/130738822/rilotevutumujudo.pdfIn PDF document text
    • https://mibujisoj.weebly.com/uploads/1/3/4/5/134525757/424de.pdfIn PDF document text
    • http://copyright-infringement.business/c_programming_from_problem_analysis_to_program_design_7th_edition_by_ds_maliks6nud.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/d0c5279b-e06c-4adf-8cc1-1e91aa1ce8be/97851486169.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e06f7279-3978-42b9-abaf-01646396d4d5/mikiwibavejovo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d2e5bcf-c9f4-41e1-87af-c9cb7c0fcd3d/minimalism_live_a_meaningful_life_netflix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eebdd5e7-aa99-4451-86ca-c341e7563762/21386129246.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3c9e65e-03ac-4a83-810a-e7523b3741e8/the_sims_3_showtime_cd_key_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d68ec6ba-61fc-4fba-977e-ff99f2e53b91/serato_dj_software_without_controller.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4663b9d-0a59-4452-93f1-ba4c20c02b43/fepez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf188414-4997-455b-b6b7-938ddcb8c4e4/79255449843.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8352fdb6-77b0-4d45-8077-d41733171a0d/quicken_print_register.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_off00015178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15178 5312 bytes
SHA-256: 2b2dc97ff93fe62236a4a70b503a4786d9bd12ccd0693e776cd96b1fb8692cf1
font_01_sfnt_off00016384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16384 11452 bytes
SHA-256: 6c986e187d0c1d82bb574476a61366e6119e9182d2b1e6d28e9a8c5c20eb6948
font_02_sfnt_off00018a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A5C 16192 bytes
SHA-256: 9c7926b8929b88a1dffb52ec04bcfb477868fd459509337312ce674bafabbb6a