Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aea9bdefe887a71…

MALICIOUS

PDF

73.7 KB Created: 2021-03-17 23:13:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ea64bf82f05d9e7bc880aa818c962cb SHA-1: 7d3f82504e2fdf717990e08faf9b06a5e2779801 SHA-256: 0aea9bdefe887a712f425b527c30da9ae2c8505e03ee23d583cda1e328305fbc
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('pelibifir.ru') that is likely part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a pattern of hosting multiple links on disposable domains, suggesting an attempt to obscure malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pelibifir.ru/123?utm_term=information+report+template+year+2
    • http://rajukilodagoje.mygamesonline.org/81357755962.pdf
    • https://cdn-cms.f-static.net/uploads/4426060/normal_604f47e7e3e60.pdf
    • http://tuwasukam.getenjoyment.net/fantastic_mr_fox_watch_online.pdf
    • https://cdn-cms.f-static.net/uploads/4489724/normal_603c43d89c706.pdf
    • https://cdn-cms.f-static.net/uploads/4369781/normal_604b26c3f06d4.pdf
    • http://jaxagogilexet.sportsontheweb.net/what_is_lexile_reading_level_chart.pdf
    • http://telisebazelizaw.22web.org/lekuvunezo.pdf
    • http://tacfitproducts.com/66891425896fxd62.pdf
    • http://berozava.iblogger.org/domain_and_range_worksheet_with_answers.pdf
    • http://nopuvobetag.mygamesonline.org/personal_values_list.pdf
    • https://static.s123-cdn-static.com/uploads/4469128/normal_5fe30b5ad1b28.pdf
    • http://bupetud.xyz/40537278565686of.pdf
    • http://nebatomefov.scienceontheweb.net/vufizodijakoso.pdf
    • https://cdn-cms.f-static.net/uploads/4367281/normal_600f14761dcb0.pdf
    • http://wegoluxetas.scienceontheweb.net/ledaluvafajo.pdf
    • http://cadenalia.com/injustice_2_dlc_characters_codes63xod.pdf
    • http://motivawka.online/remufudojukewuzb7k3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://puwurivetib.epizy.com/2015_mazda_3_sp25_owners_manual.pdf
    • https://uploads.strikinglycdn.com/files/4bf791d7-1d97-4ad9-aa78-ad136b026dd9/rosajigobaxasu.pdf
    • https://uploads.strikinglycdn.com/files/e7d4cddb-b347-4287-a5ea-1f5b2373b363/zumo_660_user_manual.pdf
    • https://uploads.strikinglycdn.com/files/dca63dfa-fb0b-448d-860d-be0b6412feb2/19027544589.pdf
    • http://sizemogigu.myartsonline.com/64487829080.pdf
    • http://tuvixivo.epizy.com/5770506840.pdf
    • https://uploads.strikinglycdn.com/files/b67a36d3-7a72-4432-9116-89bca96e6c42/adobe_premiere_pro_2019_free_download_mac.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_off0000e396.bin
be58b63312dddb8aa1722d5100f60c8f4562b89e58995e2d023246311333e963		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE396 5040 bytes
font_01_sfnt_off0000f4b1.bin
38167ef3c60fddf5c8e120c14a3fb9943431c78ec36c14c2fa2df7d00b5efdaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B1 10828 bytes

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