Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bf0f4642063cc01…

MALICIOUS

PDF

91.1 KB Created: 2021-09-18 05:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: ce93a6f890f70a3f4f14909603b98e97 SHA-1: 862c66ef1054bb847599de496c334c526fd1948a SHA-256: 2bf0f4642063cc01c944a7e59a65cd5ae39a25004597fa945eaf1c41e365b670
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by an ML classifier as malicious. It contains a large number of embedded URIs, many of which point to disposable hosting and appear to be part of a link farm, suggesting a deceptive or malicious purpose. While no scripts were explicitly extracted, the presence of external URIs and the ML classification indicate a high likelihood of malicious intent, possibly to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 4

  • 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://medvor.ru/uplcv?utm_term=american+accent+words+pronunciation+pdf PDF link annotation
    • https://bilalyapidekorasyon.com/userfiles/file/70219176705.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/65014927885.pdfIn PDF document text
    • https://mattress-leader.com/media/14030089388.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/gewibemidafu.pdfIn PDF document text
    • http://juncheng.tw/upload/files/82230692120.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/16470247983.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/figipa.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/maxexemubodubox.pdfIn PDF document text
    • http://reylab.com/userfiles/file/munejulod.pdfIn PDF document text
    • http://www.siposferenc.hu/html/10233620287.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/89045869616.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142525a5d691---48152819019.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/3kdto4f0v67n6p44rkhtg7fqoq/ropepufoginodavarukizono.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/49379156875.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/dipili.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/fuzulawewadete.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_off0000f54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54C 10904 bytes
SHA-256: 617e0412cb7f149416fc1985954a5959911e2ca7f5d287765c4768f82c67671f
font_01_sfnt_off00010e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E96 20996 bytes
SHA-256: 5599c5bf119112b9041e21da9da25f1a2af570e07a2ffcb3cc23795be0e47b22
font_02_sfnt_off00014585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14585 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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