Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fbd645579316643…

MALICIOUS

PDF

81.0 KB Created: 2021-09-17 09:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ecd02a15748fffa661636ad187ea1d4c SHA-1: 1f8660142acf683afbf58f5e795eae5f9c3aa114 SHA-256: 9fbd6455793166435898b354f10e26664b44986e746e6177829ff1bd2447c4ec
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high number of external links, many of which are disguised as file downloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm structure, and the presence of a Google feedproxy URL suggests an attempt to obscure the true destination. While no scripts were directly extracted, the overall structure and the ML classifier's high confidence score point towards a phishing or malware distribution attempt.

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 https://tabularasa.lv/sites/tabularasa/uploads/documents/files/ravakofewudugopanewiz.pdf In PDF document text
    • http://ukkies.be/userfiles/file/45652442536.pdfIn PDF document text
    • https://esz.jp/img/editor/files/43768211209.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410e4b04b2c---nonekovediru.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/81552228883.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/vupetuvimijosutewitafekeb.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/nagomaxasegebewofosoti.pdfIn PDF document text
    • http://njchemland.com/upload/files/2172151542.pdfIn PDF document text
    • http://partnercable.com/files/84463016017.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/sosiluludakegiguxije.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131cf3b98ac5---48394519778.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/16455893034.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/xoxututijixewiwuk.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/74601728555.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/79811099876.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210904_344A2CCCBF29F25A.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/36986970680.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/lisojipiruzebupup.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/46474340845.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/gaxukexedonudoronolurabur.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/tudafubam.pdfIn PDF document text
    • https://thermaltrailrace.com/imagini_ws/10397597591.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68525017992.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=pubg+mobile+apk+for+android+9PDF 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_off0000d525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD525 18484 bytes
SHA-256: d2d69c09ec6dcdf06a1d2f690f442d0efe3f7bb6af9d8fc14ac5ec29ea5d765a
font_01_sfnt_off00010577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10577 11076 bytes
SHA-256: 8a34aa801c9f10901d90be096999f85b1d0f77654ab67ce5402561cad5aa1d35
font_02_sfnt_off00011ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1