Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca11be306260a7d7…

MALICIOUS

PDF

82.7 KB Created: 2021-09-13 02:33:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7e1a56b730d384cb40fcda4e13908dd0 SHA-1: c30f6b01a646dba5fc4769769eee7b80d3593fc4 SHA-256: ca11be306260a7d7a4aa4fafef8ed704bc02deaa1ba5efac6b4fd1010952dc8a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and one specifically uses a UTM term suggesting a lure for 'world of tanks blitz hack apk'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://philabc.ru/uplcv?utm_term=world+of+tanks+blitz+hack+apk+2020 PDF link annotation
    • http://studiotecnicodavico.eu/userfiles/files/53205995905.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/c25dbb8542ebd9e352088287084ed7d2/61742196827.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/vidumejibozokavifi.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/visawaze.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/20214297825.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/wutexip.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/85985504558.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/wibaguxuninavudipa.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/tamogiw.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/50139347804.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/95778490538.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/woduxuvawarunibatakaze.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/71122205014.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/94954153160.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/66094303431.pdfIn PDF document text
    • https://peterdegendt.be/file/banizufamaja.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/25075401077.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/dhvn5bsm7nj8dc8csve4ca5tn5/65633857032.pdfIn PDF document text
    • https://denimder.org/resimler/files/73476315301.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210902093754.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/sajabunijuw.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/84396087912.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/10285328331.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/9169054241.pdfIn PDF document text
    • https://hidropomp2008.com/uploads/userfiles/file/xozikejudaru.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_off0000d5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFF 11112 bytes
SHA-256: d3f9bc072cdbb9a7b4e647544140a319be6f5ecc1914e98d4e2f3a940bc2b4fa
font_02_sfnt_off000107b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B1 20724 bytes
SHA-256: e6d6433341d951d1b877acf61dc3104448b632608b8d390eb4d5ea2103f1830d