Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f4ed3d386888020…

MALICIOUS

PDF

76.0 KB Created: 2021-04-05 09:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f49512dba4f0e9c6533ad2561c45dae1 SHA-1: d680e0a617bfc271bf568f9499a6c26bbed9e793 SHA-256: 6f4ed3d386888020fd846501e5bfbce98bbaa00ac0e6562d77a05f99846d2597
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier, indicating it is likely a phishing or malware delivery attempt. The presence of a large number of external links, specifically a 'PDF link farm', suggests an attempt to manipulate search engine results or redirect users to malicious sites. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/wix?keyword=guido+da+montefeltro+inferno+27
    • http://vazifesi.iblogger.org/laxipajedigaparomiju.pdf
    • https://cdn.sqhk.co/jomutepe/dEj7Xif/35069562886.pdf
    • https://cdn.sqhk.co/waxoxewanuvi/Jjgfjgq/sonny_gray_yankees_trade.pdf
    • https://cdn.sqhk.co/jevamivuvugi/dggZLlm/jibopexajadipixedipike.pdf
    • https://cdn.sqhk.co/pinebiven/gqhchdP/jijikoripawix.pdf
    • https://cdn.sqhk.co/voguzasijur/gjifij9/meteor_hitting_earth_2021.pdf
    • http://kaguveka.22web.org/mi_band_5_vs_realme_smartwatch.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://92fa68c6-d088-48c5-94d9-776fe0504fc0.filesusr.com/ugd/5a053b_9793cb21e44b4da88f8b272471140798.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e2169c3e-8b20-4af4-a05f-11bed233bae9/jubutupinoroxogo.pdf
    • https://uploads.strikinglycdn.com/files/909e657b-5752-411a-9902-5f7f6618262b/jovadogiramidefu.pdf
    • https://uploads.strikinglycdn.com/files/bcc09dae-6019-446c-a243-dd2d2db3437a/17834944387.pdf
    • https://uploads.strikinglycdn.com/files/ed422e15-bdb0-4e56-9e12-7817960031f8/characteristics_of_a_good_teacher_essay.pdf
    • https://uploads.strikinglycdn.com/files/2a58e927-d758-47ef-a31b-dd5c508e78bc/the_christmas_carol_2019_episode_2.pdf
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_67c1d022a25447748a03c7f40c8c2bef.pdf?index=true
    • http://bubanav.epizy.com/aonde__feriado_dia_20_de_novembro.pdf
    • http://siberasule.rf.gd/consumer_reports_best_midsize_suv_2016.pdf
    • https://uploads.strikinglycdn.com/files/10eee7f9-f8a1-4560-bb22-3243ab9150ec/xejefu.pdf
    • https://6f847715-c85a-45d9-ae5c-7c68cc800588.filesusr.com/ugd/6e100b_454460e154be4103a86f9482f704c7c3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/07976dc8-2abf-4ae9-944b-5c908d16fb25/uses_of_psychological_tests_in_counselling.pdf
    • http://mirimanomuropa.rf.gd/fufegov.pdf
    • https://73ea35ec-f0b0-4773-8bcb-d62b778c7de8.filesusr.com/ugd/a8e976_21cb0d5c32b04e54bd15c3b6bf280244.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_off0000ec35.bin
bfa2b8c02329c09e13ad93a1fcb6e1e2a52b806598cff39f08412a2bd37d27aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC35 5120 bytes
font_01_sfnt_off0000fd94.bin
e3ff0f1225b3ab76361edc2c25ed494528737656d7c454da4500836a8f8e0185		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD94 10884 bytes

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