Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc78264c8476785f…

MALICIOUS

PDF

88.9 KB Created: 2021-10-08 05:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 58b0a583c55dda0e6842b7645d559bcf SHA-1: 59543b12b62fad0e4cbe8e6a32bd341532047239 SHA-256: bc78264c8476785f5cb0f594a1f2971f49035e1ec284bcfac088ab05f79871c9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially malicious content or phishing sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the heuristics point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://deltools.com/userfiles/file/soteperidapukevopuvab.pdf In PDF document text
    • http://campingwithconvenience.com/files/files/45194050248.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/70196022317.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/60183041337.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/guxabavoxavawuwusijomexi.pdfIn PDF document text
    • https://ysh.my/userfiles/file/46596525029.pdfIn PDF document text
    • http://brukbet.com/user_images/file/juzarovemaxumiz.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109102018168820.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/70961971060.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/78310543047.pdfIn PDF document text
    • https://tigapilar.com/upload/files/bijoludurijodez.pdfIn PDF document text
    • https://synersys.fr/contenu/file/51844741671.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210910063435.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/tozevebalatogajavilovuz.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/13768278008.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/81296323134.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/4840009255.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/rexus.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/filawumivetum.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/c0709bf272d8b02172b6233cc3a093fa/zolabobidiw.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/zibuvaper.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=tamil+bad+words+with+meaningPDF link annotation
    • 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_off0000f29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29D 19836 bytes
SHA-256: 540c87a4e74aa1d62f115c1ea9a0562e6d71d777af2f437f6466915def4a7295
font_01_sfnt_off0001257a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D91 10884 bytes
SHA-256: e4b1609cced3197e43c5057abbb1168f93782982a594f44fe215cc566c5b020a

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