Malicious PDF — malware analysis report

Static analysis result for SHA-256 514bac373cdcbeaa…

MALICIOUS

PDF

80.7 KB Created: 2021-09-12 21:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a6cfce5cf020ad712d049f017c0f0edb SHA-1: 942e3264a0a1015d0777e2cd3eadaa3f887904e1 SHA-256: 514bac373cdcbeaa21d891ef86cbc527e69a3bf96e7acc4519ceeb797dd2a2db
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs pointing to external PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further supporting a malicious intent to distribute or phish.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://ketchas.ru/uplcv?utm_term=best+recycle+bin+for+android PDF link annotation
    • http://etoprosto.ru/ckfinder/userfiles/files/giwujoketebaxun.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/3063646333.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/filoje.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/23353851141.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/majafuzenozo.pdfIn PDF document text
    • http://parentini.it/userfiles/files/xudakekumeluwaleno.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/xuxaresepakate.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/puwiwep.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/juvopalo.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/15682954539.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/73518093374.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/bopokofawedekoteded.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/55454534740.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/40907624769.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/xuxoduturetim.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/84122832296.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/95197628490.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344c81e35b2---35749184047.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/kupoxirarokufadegukoz.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/16726294486.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/vowefal.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/nopezolupefujuk.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83234708482.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/rovamit.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/dazazudigupotolagezedo.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/40058747120.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/jadotukuraguluvafukojituj.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_off0000d6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D4 17508 bytes
SHA-256: 14201e5587194ed141c701fdfbddba49a1f2cdeec0073636a685b3863397069b
font_01_sfnt_off00010407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10407 10776 bytes
SHA-256: 3ed0bda80cd7806f0a05d6a07f390647906dbf0a449a63a4f19ec9a7f832cada
font_02_sfnt_off00011d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1