Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cc104feb1924682…

MALICIOUS

PDF

68.5 KB Created: 2021-10-02 18:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: becfb4d574a92283e0e681615074fc44 SHA-1: fcc75448f7a37599b7b84b8414f03aa56b3e318b SHA-256: 0cc104feb192468221b57dda50fcfd77dff485ba33aa7af426a9aefa079621fb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains a large number of embedded URLs, many pointing to unknown domains, suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, further supporting this assessment. No scripts were extracted, but the presence of numerous external URIs suggests the primary attack vector is directing users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/megaxojikevifobinos.pdf In PDF document text
    • http://movitecnic.com/ressource/site-image/files/nuvupimudosovudodesodid.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/xabiduvawejekob.pdfIn PDF document text
    • http://normel.org/files/upload/file/3876689625.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/namajusosesalomo.pdfIn PDF document text
    • http://cobweb.janci.net/upload/files/48499882310.pdfIn PDF document text
    • https://masukpt2.com/contents/files/xosup.pdfIn PDF document text
    • http://tsyrulnikov.ru/upload/file/41705296364.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/dupidurev.pdfIn PDF document text
    • http://livilgirls.com/files/suxuvukolikoli.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/wukine.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/begadumizil.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/161403feebaa0f---24035203303.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/zakedevamubalirujusi.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/pebuwusogufetunalotexif.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/renotomejojom.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/21841830834.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/xovovobekenenas.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/dawuwadod.pdfIn PDF document text
    • https://tanvietnamdinh.com/uploads/files/notilon.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/59627907037.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/zinafutuwovetafito.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/77306242595.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/xolibu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=for+catch+upPDF 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_off0000b10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB10D 10004 bytes
SHA-256: 81aa2d99c4b348288ace03d931f755b518edaaf2a398756f77cda1a979296d3b
font_01_sfnt_off0000c759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC759 14812 bytes
SHA-256: 3717ceeec57f2a84ead7cb19da389a464527b2743253f60c282f34f9473ea185
font_02_sfnt_off0000ec7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1