Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9bcf90efb6424c3…

MALICIOUS

PDF

80.5 KB Created: 2021-03-23 23:23:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3f9ab7ba598cb4faecfbef2bb105d7f SHA-1: 675195c13097ce87688cfdcfa4fe69d18b782e52 SHA-256: a9bcf90efb6424c30ba370a6a93de96d043b643417fdd6df2cb83f8fd4b93074
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, suggesting it is part of a link farm or phishing operation. The primary URL points to a search result page, likely a lure to direct users to potentially malicious content or further phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/wb?keyword=3d%20animation%20apps%20for%20android%20free%20download
    • https://fepapidatimupiv.weebly.com/uploads/1/3/1/4/131437812/peziromaw.pdf
    • http://xiledokujajipo.22web.org/mubarokajiletarafobo.pdf
    • https://gavufiwi.weebly.com/uploads/1/3/0/7/130775220/1056244.pdf
    • https://gudabujazoz.weebly.com/uploads/1/3/0/7/130739385/masutumexa.pdf
    • https://puzesijokivokef.weebly.com/uploads/1/3/4/3/134312217/fukibepuri-melota.pdf
    • https://fedonofawok.weebly.com/uploads/1/3/4/8/134881994/6597676.pdf
    • https://xilexuluta.weebly.com/uploads/1/3/6/0/136094269/2040048.pdf
    • https://vevumugenewasu.weebly.com/uploads/1/3/0/7/130776279/walisiripek_mirukifo_jidufawofari.pdf
    • https://nobakavukip.weebly.com/uploads/1/3/4/3/134373074/e5e23735.pdf
    • https://zosupexaduj.weebly.com/uploads/1/3/0/7/130738593/7427949ec3.pdf
    • https://fozirufimagez.weebly.com/uploads/1/3/0/9/130969558/c4c93e53.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://beremegirapum.rf.gd/p3_international_p4460_kill_a_watt_ez_electricity_usage_monitor.pdf
    • https://uploads.strikinglycdn.com/files/41959798-7e25-4d7a-a686-b8c85d1031b8/27125713561.pdf
    • https://uploads.strikinglycdn.com/files/9f61e553-3597-4db9-aef1-74d5e19c3d7c/recap_of_game_of_thrones_season_1.pdf
    • https://s3.amazonaws.com/kezemiradigu/302676118.pdf
    • http://mofetezasenur.epizy.com/xavonigonopilelalori.pdf
    • https://s3.amazonaws.com/zumomasugipeno/low_cost_hearing_aid_project_report.pdf
    • https://s3.amazonaws.com/lepefi/bioplastic_production_from_algae.pdf
    • https://uploads.strikinglycdn.com/files/cb1d6be5-cc38-4604-aa4a-06563ece8809/materia_y_energia.pdf
    • https://uploads.strikinglycdn.com/files/e2b1fa70-d070-4c37-8262-35a6563c5ec0/somarasugixijuz.pdf
    • https://uploads.strikinglycdn.com/files/6815ef60-4dcf-41de-a94f-51745d289ca6/xipanozi.pdf
    • https://s3.amazonaws.com/bipovoromoj/tobulisegos.pdf
    • https://uploads.strikinglycdn.com/files/391d5cdb-3b19-47fa-aa84-96673a0e61ca/31433426451.pdf
    • https://uploads.strikinglycdn.com/files/7a7942d4-fe77-4b33-a740-540e51cec82f/sibibipepusaponajivimago.pdf
    • https://uploads.strikinglycdn.com/files/ef704f37-f05d-421e-92e5-2063a447b83c/86821994719.pdf
    • https://s3.amazonaws.com/fefurorobumi/25135200066.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_off0000fbe4.bin
6956980ff5dde0d71781fa18df61aa57aeb5c8f0e71d8a2106597806170fc3b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE4 5348 bytes
font_01_sfnt_off00010e0e.bin
4b00979cbc570ebdb211c7ce368b4d70193b57af38f597f1d478687c65ac1dc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0E 11260 bytes

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