Malicious PDF — malware analysis report

Static analysis result for SHA-256 126ac5c343fe1410…

MALICIOUS

PDF

76.4 KB Created: 2021-04-07 20:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 219ae0efab6d0148afdaa462dd44ff61 SHA-1: c6373cb4a7d1c717901a5a87ec08739b2203898d SHA-256: 126ac5c343fe14106199833e3617c51100f9c5d64eed77a0b5d99ce5a843e03c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. These links point to various domains, many of which are hosted on disposable or less reputable platforms, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware via the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://golowaki.ru/123?utm_term=national+immunisation+program+schedule+2019+pdf PDF link annotation
    • https://cdn.sqhk.co/mogizufofuj/jghcdid/secrets_of_the_empire_gameplay.pdfIn PDF document text
    • https://cdn.sqhk.co/bigulikexupa/azN03gh/fall_guy_tv_show_streaming.pdfIn PDF document text
    • https://rasuzumiketasak.weebly.com/uploads/1/3/4/3/134393825/pomepuwiropepodafixu.pdfIn PDF document text
    • http://tarezirok.mypressonline.com/sap_basis_books_for_beginners.pdfIn PDF document text
    • https://cdn.sqhk.co/wigalefu/jjjiiiZ/30325483126.pdfIn PDF document text
    • https://cdn.sqhk.co/suwapipejob/Ltifeii/galactic_attack_alien_shooter_gift_codes.pdfIn PDF document text
    • http://xexejevun.medianewsonline.com/80970065390.pdfIn PDF document text
    • https://cdn.sqhk.co/dasotipamu/obmGPgc/z_black_song_bestwap.pdfIn PDF document text
    • http://fridgeservice.ru/butterball_turkey_fryer_xxl_near_merad5a.pdfIn PDF document text
    • https://cdn.sqhk.co/gufezima/ESihhg0/84747771520.pdfIn PDF document text
    • http://duplicwcnj.space/affairs_cloud_current_affairs_july_2019ajmdk.pdfIn PDF document text
    • http://dfwshootersupply.com/what_are_the_6_most_common_elements_in_living_thingsop0y4.pdfIn PDF document text
    • https://xufefizomuziz.weebly.com/uploads/1/3/5/3/135346589/4b842.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwetebep/fEh7Imv/bsnl_new_vasantham_recharge_plans.pdfIn PDF document text
    • https://tapizijivuvol.weebly.com/uploads/1/3/2/6/132696465/9431648.pdfIn PDF document text
    • https://cdn.sqhk.co/tamaladafa/dIp3Wij/airline_manager_4.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/14181566-8e6f-4c11-8c0c-ba018ddbcd58/logo_quiz_world_daily_challenge_answers_today.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9a12026-8445-4a25-9caa-4eb7e8b88437/how_to_program_a_radio_shack_pro-135_scanner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efc3530e-7f46-4099-bed9-3e8c1018c82a/what_are_the_4_categories_of_processes.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_off0000e867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE867 6020 bytes
SHA-256: 67c482c640a5a0a1eb41b5a3b057f59e1e257f45cd16e3e00e0774d8db8c5059
font_01_sfnt_off0000fcc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC7 11160 bytes
SHA-256: d7ffdc857f4defb5b12c5af5a08362b3ec8b5abc144340d400040bab35b522c2