Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2ff874e0d2d94ea…

MALICIOUS

PDF

77.3 KB Created: 2021-03-20 10:05:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a76e2072373f043515e42d9c31b53779 SHA-1: 2a49b701b3628237fcf9be956d5745e8fea5b1c2 SHA-256: c2ff874e0d2d94ea1063fb22c934c5e47eba38f636eb3eea7e9b96912591ae7f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a 'PDF_SEO_LINK_FARM' suggesting a large number of outbound links intended to manipulate search engine results or direct users to malicious sites. One prominent URL, 'https://nipisod.ru/strik?utm_term=faiths+and+pantheons+3.5+pdf', is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nipisod.ru/strik?utm_term=faiths+and+pantheons+3.5+pdf
    • https://sezibuginodeso.weebly.com/uploads/1/3/4/4/134470526/pajotevafeserit.pdf
    • https://gamojomifelaja.weebly.com/uploads/1/3/0/7/130739258/1941197.pdf
    • https://wexipemeb.weebly.com/uploads/1/3/4/8/134860193/suzupit.pdf
    • https://rejobasagiletez.weebly.com/uploads/1/3/4/6/134642313/nenotomusajepaf-xekatidozazinur-gunukesaru-bomaru.pdf
    • http://neletaparufo.scienceontheweb.net/61342389162.pdf
    • https://kuxodebareku.weebly.com/uploads/1/3/4/0/134042390/tuwuwukot-zojivebazut-pidumafub-bulobiber.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/laginekux/tumijuxuwosaluzafuzirijuw.pdf
    • https://uploads.strikinglycdn.com/files/9af84584-4f2b-491c-a551-102061fa13f3/elementos_de_la_tabla_periodica_en_espaol_e_ingles.pdf
    • https://uploads.strikinglycdn.com/files/ec108773-68bf-4e15-8283-0f4cda44aab1/westminster_chime_clock_value.pdf
    • https://s3.amazonaws.com/jepinebawo/complete_cost_sheet.pdf
    • http://likutolejit.onlinewebshop.net/verizon_fios_ipv6_nyc.pdf
    • https://uploads.strikinglycdn.com/files/8efeea9c-b771-4f8c-b5f2-e4be12859725/gas_wall_heater_thermostat_troubleshooting.pdf
    • https://uploads.strikinglycdn.com/files/8c94ead5-0101-4951-8fd5-a6f68679b8c5/what_were_the_three_social_classes_of_the_medieval_period.pdf
    • https://s3.amazonaws.com/gonima/68001786171.pdf
    • https://s3.amazonaws.com/xapota/toro_20332_belt_replacement.pdf
    • https://uploads.strikinglycdn.com/files/4cc41148-2917-469f-9cd3-09dac187b396/31493209690.pdf
    • https://uploads.strikinglycdn.com/files/cfe0e317-5102-4cee-8190-fa28b0eefbaf/pivokovu.pdf
    • https://uploads.strikinglycdn.com/files/309a3080-e6ee-457a-b444-d3fc7152db96/lexus_gs_450h_f_sport_horsepower.pdf
    • https://uploads.strikinglycdn.com/files/92ccdee0-643c-4d26-a675-8c94a3e3e0bd/80249849836.pdf
    • https://95a83a18-022f-4aa5-9dc2-588eac4c5c4a.filesusr.com/ugd/ccb6ab_1b9843aefa9b48688042001abaa31155.pdf?index=true
    • https://uploads.strikinglycdn.com/files/444f1097-68ca-4bb7-ba56-d3a34f8eaed5/fasefurekam.pdf
    • https://uploads.strikinglycdn.com/files/121245a3-24ec-4973-9491-750cab8ec47c/89822890217.pdf
    • https://16fd3b15-5541-4454-9538-28daacbf497e.filesusr.com/ugd/e32576_6c9de366feda467992c19e82769f0874.pdf?index=true
    • 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_off0000eecc.bin
4445cacbcb1b215ff5c59755e8b15d969323ec49e76720e1888150775439a6c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEECC 5276 bytes
font_01_sfnt_off000100cb.bin
9a6bba51cf854806dcc6fc6319cc317b8206ece26bbf205f736ee3a1473dce04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100CB 11632 bytes

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