Malicious PDF — malware analysis report

Static analysis result for SHA-256 94f9ec447a02f6a9…

MALICIOUS

PDF

75.0 KB Created: 2021-09-24 03:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a2a57e54f4ed189ca01cd592bd03d918 SHA-1: 3d5582bc54391b3b54d49ca1e4fd5bf701d8972c SHA-256: 94f9ec447a02f6a91d329bf15a627a024d2b7ec2485cb550a62ed51bd837129b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The PDF contains numerous embedded URLs, many of which point to potentially disposable hosting, and one heuristic specifically identified it as a link farm. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://www.chatanakonci.cz/userfiles/file/muxifulu.pdf
    • http://yas-center.ru/userfiles/file/75402739578.pdf
    • http://odpadykj.cz/UserFiles/File/50855324698.pdf
    • https://muratay.nl/userfiles/file/47714902949.pdf
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/ravofe.pdf
    • http://www.ciesol.es/ckfinder/userfiles/files/68270622012.pdf
    • http://photopuzzle.net/userData/board/file/bisujum.pdf
    • https://gsacademy.ge/uploads/files/jisaximepemonoboja.pdf
    • https://hsse.hssanesteban.cl/files/marepurugejixumikunoza.pdf
    • http://unsersohn.ch/images/file/28826405140.pdf
    • http://cjmfgx.morefriendship.com/upload/files/suneg.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161493d3249cf4---mizala.pdf
    • https://zweefvlieg.net/userfiles/file/32402704097.pdf
    • https://advantage.ee/media/contents/file/16614626487.pdf
    • http://lovesushiscv.com/uploads/files/82670598250.pdf
    • https://rallstarawards.us/nbloom/fckuploads/file/45973228018.pdf
    • https://www.mnogotrop.com/ckfinder/userfiles/files/6450339441.pdf
    • https://total-sport.pl/img/upload/files/89611956668.pdf
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/junarubitumozasanamemu.pdf
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/50835888847.pdf
    • http://pjteam.hu/uploads/65191663913.pdf
    • http://mylodge-naoshima.com/images/blog/file/8779939675.pdf
    • http://modamoda.nl/uploads/pic_lib/file/vidufikumadogena.pdf
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3728791630.pdf
    • https://shellserva.nl/docs/Image/file/kogowafapulako.pdf
    • https://solener.info/ckfinder/userfiles/files/zedigizeleba.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=stranger+things+season+2+episode+2+script
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c209.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC209 16792 bytes
font_01_sfnt_off0000da20.bin
3f7e60d5bf36616b23a13eacde40f1f61101bb732f26d62f6bc92d86ae424c65		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA20 10940 bytes
font_02_sfnt_off0000f334.bin
8aec41553c9d532aa0a1043afcc5993f49c7fa97836460ebae9852b6bf1ce5be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF334 16956 bytes

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