Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b87594ea43a1814…

MALICIOUS

PDF

83.2 KB Created: 2021-09-10 14:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: c27a6e58592c347a2d06cf0740b77f59 SHA-1: 4df5a222281ede0edc89b375508bc4add4e5e424 SHA-256: 8b87594ea43a181433be752e312029e5c88da8df68a213ce6043d78b1939af6e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://srldirect.com/ckfinder/userfiles/files/levuda.pdf In PDF document text
    • http://wellfoto.cz/pictures/files/roredono.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/u8sj59ptf6gq16ccjbg7eguhsh/lomadirajeretorixuzo.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/75355738716.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/vibegojeboninagi.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/sovirixapolaz.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/pigodupovineworosuv.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/4753833083.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/68712233401.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/legikikojuvaji.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/52104376850.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/nalewubilak.pdfIn PDF document text
    • http://rsentco.com/upload/file/vunakub.pdfIn PDF document text
    • http://datcat.vn/2018/file/sesodel.pdfIn PDF document text
    • http://zae.me/datafiles/file/vosar.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/15134261267.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/fazalazasigofimupokuv.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/vemopakifoviva.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/wetakefutepowop.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wefejolige.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/midibofimupalezidoxo.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/1239976192.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/kasabivikituxegom.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/10669466302.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=r%C3%A9cup%C3%A9rer+photos+effac%C3%A9es+sous+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_off0000dab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CF 10972 bytes
SHA-256: c6a217802a096b4f3f6d83269b4c8ae39eba3af36055bc84ee6c1a3dc1fdaa83
font_02_sfnt_off00010bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEC 19836 bytes
SHA-256: 9a84efab51e0dc8e0607a1ea729d73fc0f516547f17ba552b9152d57cab2a08e