Malicious PDF — malware analysis report

Static analysis result for SHA-256 98b6cdfd9c8aa146…

MALICIOUS

PDF

84.8 KB Created: 2021-09-22 11:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7fe471dcd9519ffd276b8be05a0ed2cd SHA-1: dc99cd7df621b15373e5be629eada969d342ae18 SHA-256: 98b6cdfd9c8aa146b0d6b20c1c8cac212c64045ee16f41ab079f6da537f3a7ca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. The presence of many links on disposable hosting suggests a link farm or phishing attempt. Although no scripts were explicitly extracted, the PDF structure and external links indicate it's designed to redirect users to potentially harmful websites.

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://nomylo.ru/uplcv?utm_term=the+walking+dead+world+beyond+online+free PDF link annotation
    • http://debeleven.net/UserFiles/File/56732531917.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/7169797968.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/pufodorujogukavoselete.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614159c1a0363---68870191181.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/52195268227.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/wilurubosujazavebep.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/29002936682.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/46097349787.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/71546488263.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/32390006552.pdfIn PDF document text
    • https://businesslife.com/content/file/51700135106.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/87383096475.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/14590668486.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/86477181700.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/sifawerujof.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/34368335813.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/57188646075.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/6361104069.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/pinogajalesufunibariti.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/gogikoramopinulugofogexus.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614965b570b99---1140329733.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/nokujomoka.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/ginulagub.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/fujapizobimevazapujezumi.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_off0000e3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC4 10764 bytes
SHA-256: 547fccda7660c0eefed79869b5e7f7d96c7975bfca4db12ab91fdeac40b05c4d
font_02_sfnt_off00011440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11440 18968 bytes
SHA-256: 985a4cc74d7a9515aef0035e2494a66e2d5871a20eaa50d18a3b747c168382a0