Malicious PDF — malware analysis report

Static analysis result for SHA-256 6815d0227355e1cd…

MALICIOUS

PDF

94.3 KB Created: 2021-09-19 00:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f3af85e0f18e37f6303db71d0fe5a0ba SHA-1: 48fe1270bea3d71c88b831aeab1e9e9f67480157 SHA-256: 6815d0227355e1cd24f76f7f8b4d375133b9433cb5031e8fbd844609b7a3358e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple domains, one of which is http://borik.customreal.sk/data/files/53545693227.pdf. The document body is heavily obfuscated and unreadable, suggesting an attempt to conceal its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://borik.customreal.sk/data/files/53545693227.pdf In PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/73058130638.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/69817840412.pdfIn PDF document text
    • https://keongracun.org/contents/files/31268222426.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/76108111212.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/nogulat.pdfIn PDF document text
    • https://petikdaun.com/contents/files/kopofapenotutin.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/vuzududa.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/sulomoruxozimokiwoxafik.pdfIn PDF document text
    • https://kiptep.ru/file/zogogakedafefaledil.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/742ea1be727a619008497e8d4cff5dbb/57913228496.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/81481646561.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/96464180088.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/47620664773.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/mosobofojifejurimed.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/tomesisorulek.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/noruxodokurufalewikujofis.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/19401019420.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/kelapin.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/79997921970.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tomumasezekufojadigojomu.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/tawuwilejetufetoru.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/viwakerobuzin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=text+writer+for+androidPDF 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_off00010d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001254b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254B 18252 bytes
SHA-256: 0ab3420e284383139d1f6a38b8960cf6e4761533e25a48f1245a5abca3c32608
font_02_sfnt_off00015429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15429 10284 bytes
SHA-256: 8167ee03d7de60d5c0869a0b25187812fa806c21fb212b8fdf3cfbe82c3787de

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