Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ccb9d450fcf3219…

MALICIOUS

PDF

72.8 KB Created: 2021-03-19 20:05:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5001a3c56ff2521647433d463eb353d6 SHA-1: bc13803ff00f06e53ae361387dbfb4f5d705d783 SHA-256: 8ccb9d450fcf321921d876acb4b7b8266a5f927b483cbfec6814596477cd1ef9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. One of the external links, https://nipisod.ru/strik?utm_term=icom+ic-208h+for+sale, is directly associated with a heuristic firing indicating an external URI. The ClamAV detection and ML classifier also strongly indicate maliciousness, likely related to phishing or trojan activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=icom+ic-208h+for+sale
    • https://cdn-cms.f-static.net/uploads/4458633/normal_6047cdec15d2d.pdf
    • http://newoxinap.66ghz.com/14651467259.pdf
    • http://mmmuuuue.space/fovuwalamajmt2f1.pdf
    • http://mynasert.online/navy_blue_mens_trench_coatxfmzr.pdf
    • https://cdn-cms.f-static.net/uploads/4388407/normal_5fd64ef946f54.pdf
    • http://tonivatibiri.22web.org/oxidative_and_substrate_level_phosphorylation.pdf
    • http://daravto18.ru/munchkin_game_rules_faqc5xkr.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tiduro/great_gatsby_chapter_one_questions_and_answers.pdf
    • https://s3.amazonaws.com/tapelu/purevpn_for_chrome.pdf
    • http://lunanopabefi.rf.gd/ejercicios_just_already_yet.pdf
    • https://s3.amazonaws.com/tubukeganuji/60691131684.pdf
    • https://s3.amazonaws.com/pazatuv/apply_consolidated_marksheet_madras_university_online.pdf
    • https://s3.amazonaws.com/jupudizadid/liverpool_vs_barcelona_ucl_2019.pdf
    • https://28932ed2-21d9-4123-99cb-fcff0aac4472.filesusr.com/ugd/cc089a_05777b97ac5c4a7082a95a89e603fc8d.pdf?index=true
    • https://5c09c65f-4728-49e3-9562-8692e696fc4f.filesusr.com/ugd/32acb1_db065a4647c04295821dc2a0e838057b.pdf?index=true
    • https://s3.amazonaws.com/vatosolikijike/povepozofemedamodefo.pdf
    • https://s3.amazonaws.com/zufojadibi/40661693690.pdf
    • http://rozasazi.epizy.com/50893003851.pdf
    • https://s3.amazonaws.com/bakoloj/zeitgeist_player_s_guide.pdf
    • http://xivanuw.epizy.com/weraregoxososubawume.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_off0000d7c0.bin
cb10b527d3b00d20d6895aacdc8c837dc993614e0bb8d918f91de857b262e1b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C0 5560 bytes
font_01_sfnt_off0000ea84.bin
c9f3270686ce36fb9c8651e6058936edbe1b74233abeec25a6b951c194c2ba15		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA84 12964 bytes

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