Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbc4e79e7bfb4306…

MALICIOUS

PDF

86.1 KB Created: 2021-09-20 15:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1cdc331e86961dc292af0085bc393f1e SHA-1: e67bcdc7030725e32cf11defcf3e4e1cd528e9b9 SHA-256: fbc4e79e7bfb430684ffe0bf6697547da06eaddc42d5c590d461f36e850036f3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://drafthe.ru/uplcv?utm_term=best+mind+games+for+android PDF link annotation
    • http://www.sctiec.com/up_files/FCK/file/kagafoxerukerisuwupuwixa.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/54775814275.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/366770827941630815986.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/36802353021.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/ralinesarevew.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/6644952810.pdfIn PDF document text
    • https://salonrewards.ca/images/file/gagirisex.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/zodomapisikixakokijofupez.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/nakarusakebezopomixi.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613956dc0edff---vitakefux.pdfIn PDF document text
    • https://alexspa.pl/userfiles/file/xobugawimixemuxefu.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/16/woxijipovokirefifaj.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/b3eaf1e47b791581d1e27aa2cc1468c1/fototuwus.pdfIn PDF document text
    • https://tgvl.in/uploads/fck/files/gazugarakigiler.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109200351492535.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1614496f76e577---98214758307.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/mosiwodilaseninosik.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/11038297866.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/guligidolijizivos.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/webupebezad.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/dizupofixuxol.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/vetulijezizagimejepej.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8A 17024 bytes
SHA-256: 0bc8a83e0c3775d50d99d7dcb21bad6ccf1d21a194c7f82a6e26481077b07aad
font_01_sfnt_off00011a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13275 10704 bytes
SHA-256: 521250ab0ef9410a031efecd6776eb5f649e8a4ae38a48511308541362414477

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