Malicious PDF — malware analysis report

Static analysis result for SHA-256 86bfa6c689c7eaf3…

MALICIOUS

PDF

71.5 KB Created: 2021-03-08 12:33:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: c66ff34e586a6f3f89aeceb05a08e4eb SHA-1: f23c5d94221b418a857d72ae53d0b70e96ab9077 SHA-256: 86bfa6c689c7eaf3e2c8f4191174b9ad78e21bc2e2f4034c71979e1087ca4ccc
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic to direct users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to exploit users by redirecting them to potentially harmful websites.

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://jumiwimov.ru/award?keyword=binomial+theorem+quiz+pdf PDF link annotation
    • http://kuzexamipapoxip.medianewsonline.com/rimapaforif.pdfIn PDF document text
    • http://kizunawinim.getenjoyment.net/labodigosujubusonowemator.pdfIn PDF document text
    • http://nozekem.iblogger.org/the_secret_life_of_the_american_teenager_season_3_episode_10.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://rujidafedisezu.atwebpages.com/61842085104.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e0c83e4-780e-4803-b875-3bb105e65ad8/tisovixomos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64074c9e-e9f4-4786-be6a-fb8a03f9824f/the_purple_book_occupational_therapy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/133203cc-a3e3-47fd-b19c-84f765acfe19/mepujuges.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe721766-b9a6-49c7-b3c3-92dcd7376efd/6728709949.pdfIn PDF document text
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_1d9babc4ef8740cda56dc0434083cab4.pdf?index=trueIn PDF document text
    • http://weparaxopulo.atwebpages.com/nail_salons_that_open_late_near_me.pdfIn PDF document text
    • http://xirexadugimog.atwebpages.com/jidufuvagatoporobuligo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f48bd21-ee1d-451e-af0a-1c69a52a8041/10327654030.pdfIn PDF document text
    • https://7f2467c6-0d80-4e38-8df7-27624e0b9669.filesusr.com/ugd/e19533_1da5a1bee90443cfab2c83061a851021.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9297988-9b84-4359-8b62-dbd3ab9871a2/statistics_with_r_specialization.pdfIn PDF document text
    • http://pufupivati.epizy.com/20823356432.pdfIn PDF document text
    • https://22520ec4-2132-45a5-98b8-54db1b71d3ea.filesusr.com/ugd/b33b96_831f6c3068d44762ac3cc135d5f6d4ca.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0086ec49-04d5-4536-a30d-53afc5a63bc9/lobby_hero_play_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88e97a9b-7b38-428e-98ca-544d2060ba18/61963700871.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE43 5208 bytes
SHA-256: 549745ce4f1e6991f0cb7b2e1482b6dc9334511db5fba9a33400965022a3cd69
font_01_sfnt_off0000dfc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC2 10276 bytes
SHA-256: f3218a215a37ec78351b3586111f09dd3f4a567de04e2b7fade6822f2c594c95
font_02_sfnt_off000102f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F5 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333