Malicious PDF — malware analysis report

Static analysis result for SHA-256 b14f9f0544bb0ac0…

MALICIOUS

PDF

83.1 KB Created: 2021-09-10 05:21:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3d81c7ff373251d63b4e4ae9981ba07c SHA-1: 1f26386b5ffd00701a05f9cd28992f028238a862 SHA-256: b14f9f0544bb0ac02266bb15bfda3d082523c41c1940f0d44f86dc060b4cbcae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URIs, many of which are on disposable hosting and utilize UTM parameters, suggesting a phishing or spam campaign. The presence of embedded JavaScript, though not explicitly detailed, is a common vector for malicious PDFs to execute further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=david+diga+hernandez+books+pdf PDF link annotation
    • http://jmk.kr/ckfinder/userfiles/files/19799343440.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/62498542069.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/69277086280.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613536d79502f---bixejezox.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/lovurupebivogatem.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/93714363095.pdfIn PDF document text
    • http://askort.pl/Upload/file/60443502791.pdfIn PDF document text
    • http://termocity.by/pics/files/nonasopabiz.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/gavonipamodekelixitite.pdfIn PDF document text
    • http://recviem.ru/img/upload/41316017215.pdfIn PDF document text
    • http://kyea.org/imageuploads/dorefotalotadimidofa.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/kabup.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/situlisokulixe.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/raxuzudojajizodagaz.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/20337543264.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/wikanajaregamurapufuvuke.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/75794921207.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613404e0e109d---97910319430.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/94158433137.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/14463871464.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/tetimufugofijaxujelusogu.pdfIn PDF document text
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/fedirojafew.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_off0000dfa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA3 17900 bytes
SHA-256: 175e97bceb4a5b6fff25f3f1ba3ae8848f2fbe0741b06901966961e1eec77872
font_01_sfnt_off00010dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD3 10992 bytes
SHA-256: 8ddcc4b7102dc935b2081caf7f9407024b58b210d3e2fc95a46c97345b7eeab5
font_02_sfnt_off000126ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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