Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6826a6f836933ea…

MALICIOUS

PDF

83.4 KB Created: 2021-10-13 00:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0ee59dcac2983e42e9fe3d2edb89935d SHA-1: 69438fe62ba0fa603dd8dd12503bfc5318a2ee51 SHA-256: a6826a6f836933ea5db7c5a338abf936477d2c5b440ce6d0cedfdaa691c41dba
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm designed to obscure the true destination. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to trick the user into downloading a payload. The ClamAV detection further supports this assessment, identifying it as a phishing-related trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://floridadressyourhome.com/uploaded_files/userfiles/files/97909196911.pdf In PDF document text
    • http://robbymakka.com/userfiles/file/39813773374.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/64198041920.pdfIn PDF document text
    • https://kermanrooz.com/img/files/92079025554.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/nemufakakibewevomow.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1630804802EWhj.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/tusedosawusizilubego.pdfIn PDF document text
    • https://mbbs.hr/files/pawipidifavimovufipaf.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/92592813156.pdfIn PDF document text
    • http://splogservice.ru/content/file/kaliwemutuladobuware.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/76494930560.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/xidakara.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/wufikaworid.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/92445640680.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/kovelowiratirafomup.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/lidazevurexemikunuzekudax.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/rejot.pdfIn PDF document text
    • https://manenshop.com/upload/files/darevoxaxadanefuvep.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/98638369350.pdfIn PDF document text
    • http://skrutit-probeg.ru/upload_picture/file/fuxodoxox.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/lixupan.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/46673076974.pdfIn PDF document text
    • http://thedreams.cz/files/tuxonid.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/HKUGBsJGI0E/uplcv?utm_term=cbse+class+12+question+paper+2018+solved+pdfPDF 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_off0000dd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0F 18340 bytes
SHA-256: 863f4b5d641258b706cd22d1779c2a944b8fa0fddf4c10b7c20ba85b0e5764d3
font_01_sfnt_off00010c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A6 11600 bytes
SHA-256: 6274f81d291e4d9e08f21f74f15697d5e69a9a7f1b301ad3e4b517d5806c3c9e

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