Malicious PDF — malware analysis report

Static analysis result for SHA-256 92a7fa41e8051eba…

MALICIOUS

PDF

71.0 KB Created: 2021-10-03 15:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e5ad9a067e6dd81901bc139ba647f6a2 SHA-1: c0910737983c44e17873bb1aad20d80a88fde8db SHA-256: 92a7fa41e8051ebac660abe0af88862922f806d133c1b2c4fb0c452e675dfd39
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many of which are hosted on potentially disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous URIs point towards a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=cmos+vlsi+design+by+weste+and+harris PDF link annotation
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/rabotubasawagoxekus.pdfIn PDF document text
    • http://atrsara.ir/resource/files/60009449466.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/kosujixobixudekefur.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/61658140202.pdfIn PDF document text
    • http://www.heksan.com.pl/file/98018794084.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/kiwusojumewuzuwunej.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/gazikuzijexiwirew.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/lezafusajametomuso.pdfIn PDF document text
    • http://champagne-ardenne.annuaire-regional.com/ckfinder/userfiles/files/74349861249.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/78479841544.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0f9fb6364---sujasotiwa.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/zigepamutaxapozax.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/wavezatovekun.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/67149624408.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/sovovelusopavug.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/wufavex.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/xerarerizemige.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/6640643293.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16146d7eec171d---31887691294.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/wamolud.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/saforabegibiju.pdfIn PDF document text
    • https://malinaionescu.ro/userfiles/file/91882435131.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/71669484766.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/60704498814.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_off0000b151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB151 17000 bytes
SHA-256: f6aa528e54d394a16526db826301d74e3708f71668be9c94a51098d7602df23b
font_01_sfnt_off0000dce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE4 11132 bytes
SHA-256: 626b64c0c78d143418819246688f1e0c9ffc8a7312959d05d3bb24f1de2f7bc0
font_02_sfnt_off0000f68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1