Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1995291b937f285…

MALICIOUS

PDF

81.7 KB Created: 2021-09-15 22:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 99918357230342675fb8e7ac4dc33164 SHA-1: a9466ee563d6e69232ae61ff65291070f92f52a2 SHA-256: f1995291b937f2855f5785a9e56bf20b70d09eb254934c9f5a85475f15879001
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates a malicious intent to distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://archism.ru/uplcv?utm_term=xiaomi+redmi+note+9+pro+health+app PDF link annotation
    • https://deniz-sogutma.org/img/userfiles/file/25716750679.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/sekudidaxevebofowinigok.pdfIn PDF document text
    • http://tavio.su/files/file/sexedawawikibatu.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/mifeliz.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/xosubapepazalomigu.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/94570898800.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/migizusimofiweximo.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/80696184083.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/jaxawezomima.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/20156117216.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/domapevebuxozunox.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/17345449725.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/28265815683.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/xaboporedurinufopole.pdfIn PDF document text
    • https://wildnaturetravel.com/File/99834721115.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/gapixujozezu.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/zosuzukara.pdfIn PDF document text
    • http://palami.by/images/file/xerekutokifuralares.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/97119807054.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b1a62b9cd---74218571976.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/femowafasew.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_off0000d8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E1 17932 bytes
SHA-256: b6bbc4abedfdeaea585ed6e7dba9c9e5d5be46d1b2cf4816352fe9eb59997e05
font_01_sfnt_off00010759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10759 10664 bytes
SHA-256: 0543cd56a93b1ca0ee3ab8f2fb668683a97f1710954527a4f1a0871f08ccb1de
font_02_sfnt_off00011f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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