Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfd6b724b790788f…

MALICIOUS

PDF

75.4 KB Created: 2021-05-07 19:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9883a2a408b412bafce4be3f587e47bf SHA-1: 7350601f6622101f04aa8f123fa12aee6ee0dae2 SHA-256: cfd6b724b790788f39cf7cf9cdd164008760f462c1afaa8949a964892bdb472f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are likely part of a link farm designed to improve search engine rankings for malicious content. The primary malicious URL identified is https://jumiwimov.ru/strik, which is presented with a lure related to 'dolls house furniture bundle uk'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

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-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://jumiwimov.ru/strik?utm_term=dolls+house+furniture+bundle+uk
    • http://begimewabifax.getenjoyment.net/68488514215.pdf
    • https://kegozorud.weebly.com/uploads/1/3/0/7/130740561/8787119.pdf
    • http://takaweri.mywebcommunity.org/bewejit.pdf
    • http://falorilipeb.mywebcommunity.org/can_t_stop_the_feeling_sheet_music_free.pdf
    • http://gamowenugeg.sportsontheweb.net/breakfast_at_tiffany_s_truman_capote.pdf
    • https://sisareses.weebly.com/uploads/1/3/1/4/131454440/417903.pdf
    • https://xejigidusulup.weebly.com/uploads/1/3/4/7/134730122/38fa3c.pdf
    • http://vagiburenumow.iblogger.org/xijokavipefurameku.pdf
    • http://vopugixeroramox.medianewsonline.com/how_do_you_perform_istikhara_step_by_step.pdf
    • https://nutomejeti.weebly.com/uploads/1/3/4/7/134702699/jexotativul-renew-renuj-dojadesuperub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/040791a4-7672-49de-98b0-09d8df0775d2/traeger_tfb29plb_owners_manual.pdf
    • http://notaruk.rf.gd/signos_y_sintomas_cetoacidosis_diabetica.pdf
    • https://uploads.strikinglycdn.com/files/9628215a-112b-46d6-a0e4-0deb40125946/88804900681.pdf
    • https://9480ebe7-8096-4165-94d5-b35dd525e9f4.filesusr.com/ugd/07b43d_3527b43df57b458386b8cca15c71a434.pdf?index=true
    • https://184d393c-d2ff-49e5-bbcb-48626b1dbf88.filesusr.com/ugd/49be48_ce90e855d88a43f893680b3d62a03c0e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9b6005f0-5ae1-4985-88ca-8352daeeab5e/thermaltake_power_supply_tester_instructions.pdf
    • https://a7193630-a032-4ee2-b136-33837135b76a.filesusr.com/ugd/fac845_37207052a3ca405f9fa68b5ed58e5e2e.pdf?index=true
    • http://peduzolojuloji.epizy.com/8556740991.pdf
    • http://safodur.epizy.com/xiwinelog.pdf
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_7c898cbf54c24403ac24365ada2bad6e.pdf?index=true
    • http://dorerewilaf.epizy.com/craftsman_yt3000_transmission_drive_belt_size.pdf
    • http://zikoliduxa.atwebpages.com/57395502014.pdf
    • https://uploads.strikinglycdn.com/files/91ad2bdd-fdee-4e02-8dcc-1f59d8365ed8/vepomefuxer.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_off0000ec0d.bin
86361c5c9bb67c271cfecbf3866247db78311cd5591ce7c9ee1d95c60eb2a2b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0D 4988 bytes
font_01_sfnt_off0000fcfe.bin
7f7ce4b8dd14b109cce7af4ceb1247983bb49c6c8f9ed36ab547a99279748fa6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFE 10304 bytes

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