Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cea14adba033641…

MALICIOUS

PDF

80.3 KB Created: 2021-09-21 06:18:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 48a97f595bac530852a36fac4c0b1fa8 SHA-1: 3477dddce81ff600d38e7a7fb0e9e6f4aa09b571 SHA-256: 9cea14adba033641e62245a19256707e266a1241cd41f50857ca2de213b505bf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that exhibits characteristics of a link farm, with numerous embedded URLs pointing to potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to external sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ingmarcofaedi.com/userfiles/files/bizukawikizajutukixe.pdf In PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/kunufibatilepozezopumipu.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///tepemeril.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/wopiduw.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/wulamemexikananewubolun.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/62403817792.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210912071806849126.pdfIn PDF document text
    • http://fencefactoryny.com/userfiles/file/puwuzobaz.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/nigefilamizapedak.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021090801174173499.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/40899489566.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/berujivotupanufu.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/keremejizuvuvid.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/xexonawofavovade.pdfIn PDF document text
    • https://kakakmanis.com/contents/files/setev.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/xaliz.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/jozesekokaradakolibupixel.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138175b377f6---99314996487.pdfIn PDF document text
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/jiforubosezeva.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/xogina.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/9571685453.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/64092537324.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/zagebudevevitoxon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=viata+de+cartier+demoPDF 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_off0000d5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B3 17880 bytes
SHA-256: 44a7dce17a027471c343f87b2b653f7cfd681f920ba151a6b27441dfa5096372
font_01_sfnt_off0001039e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB5 10184 bytes
SHA-256: 67efaf059520540f32eb09bf68bb4b77d0e11a44cd9e66d6c2c4c570047ae465