Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3c5e598fd0d2a1f…

MALICIOUS

PDF

79.4 KB Created: 2021-06-01 02:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ebf41cf74d65f4502be345e5adbacd61 SHA-1: df683dd4420a5ba5eaf528a2fa5658a5e9360277 SHA-256: f3c5e598fd0d2a1f01683ea25724a22452d3cf750d32dd4c9aea6399f72ab232
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a link farm on disposable hosting, disguised with a 'Dota 2 guide' theme. The presence of external URIs and the link farm heuristic strongly suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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 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://resalured.ru/123?utm_term=dota+2+guide+purge PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/db23e178-6e6b-4da4-aafb-6fa6d6bf87e6/dibupovevuxumil.pdfIn PDF document text
    • http://niwomif.pbworks.com/f/48693249041.pdfIn PDF document text
    • http://xedidovetaw.pbworks.com/f/wisupura.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/303c545e-5e0c-48cf-9ff6-cd3853f69853/what_does_ice_possible_mean_on_a_car.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47df4095-ff7c-4686-a8a5-298b05ffb8d8/pioneer_woman_ham_glaze_with_coke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2aefb67-b642-43e6-898f-db168ad9e40e/how_to_descale_the_keurig_supreme_plus.pdfIn PDF document text
    • http://dekokos.pbworks.com/w/file/fetch/144416838/zudarilotunaketa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99bf2348-dbf6-479a-9ba2-cd4f3b9e4bc7/ipad_mini_5_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e49956c-bd3d-4a87-b2ca-2755652f82da/80145722355.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45f46b8a-bbe6-43d8-ba34-45066602bb55/is_pre_programmed_one_word.pdfIn PDF document text
    • http://mikabipi.pbworks.com/w/file/fetch/144433257/prove_45_45_90_triangle_theorem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f08d93e-f1c5-49c2-9759-b46fd89737de/35670277122.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af886ecd-bfd2-4d13-b0da-de8d60e7cc88/lufafepitarexutiligub.pdfIn PDF document text
    • http://garigor.pbworks.com/f/vida_y_muerte_en_la_mara_salvatrucha_chapter_1_summary.pdfIn PDF document text
    • http://mudowomuxexo.pbworks.com/f/zazepakoludopot.pdfIn PDF document text
    • http://mapijakemifo.pbworks.com/f/feradumisanawuneturi.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/w/file/fetch/144416013/xezavesuvipepok.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/w/file/fetch/144411849/20_laboratory_apparatus_and_their_uses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7314c5e4-0b51-4bee-84d8-3ffff288a200/how_do_you_crochet_left_handed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dcddc89-3020-4d61-9f55-5487852c32ec/mevaruwijelakufu.pdfIn PDF document text
    • http://poforezufovu.pbworks.com/w/file/fetch/144434118/feromivored.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a3f8f54-82e6-4231-abfc-5850efe2bd7e/6149487439.pdfIn PDF document text
    • http://poforezufovu.pbworks.com/f/fobafukifum.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_off0000fa88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA88 5048 bytes
SHA-256: 7cceff2d78a55cc3e4f5ed59b3cb3fd5c5344f514382635eb9d28924b4081535
font_01_sfnt_off00010bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD1 10720 bytes
SHA-256: cd8e3d49eac8a1e7f7b69798acb9f15b666dd1f313fbaab65fffd78318dd5971