Malicious PDF — malware analysis report

Static analysis result for SHA-256 dff53096becd0913…

MALICIOUS

PDF

69.3 KB Created: 2021-09-25 01:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 47a17956b0e89f90c632b1e8e2f677b0 SHA-1: b05b864cb3075c4dc085fd76c2e61577747583cf SHA-256: dff53096becd0913db488a312a6d73c41509bcf8b2b76fab82e32b2e00c1bdbc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://crewmak.ru/uplcv?utm_term=harry+potter+free+stream PDF link annotation
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/fegofo.pdfIn PDF document text
    • http://oldstat.ww.tj/img/file/vapiko.pdfIn PDF document text
    • http://kcwoman.medsoft.kr/pds/userfiles/files/27703016394.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/fajemogumeremanutol.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/livine.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/57597295189.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/sejabonisovukavugopulu.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/80385570479.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/51928996632.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/14784535444.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/kifixuvotu.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/28627300843.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/pokowubilug.pdfIn PDF document text
    • https://anbc31.iscriptscloud.com/app/webroot/files/file/daloravolusuxobeziwig.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/zagesuzul.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/43972477164.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/povunodixovipevetixil.pdfIn PDF document text
    • http://alptw.com/images/files/wujurilunetenomigalitoz.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/i1eqfthua5hi6r8er4ldqsdgpo/wupovaxowisaji.pdfIn PDF document text
    • http://grafitym.kz/files/file/votefamademejatopakage.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/xupajepenuraxumapax.pdfIn PDF document text
    • https://asiapharma.la/files/files/11306654857.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/tuwubifoxuxawobaxivamuko.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/85173153793.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/rudomabibise.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_off0000b223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB223 10380 bytes
SHA-256: da346a1a4ae60ba593700f736f6ba80912e89ea64d1b1f20fe116510029f6f51
font_01_sfnt_off0000c9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C3 15004 bytes
SHA-256: 111425e6ba89538a286f16988a4861bd8e52a903cf961e1ab429295737b6afbe

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