Malicious PDF — malware analysis report

Static analysis result for SHA-256 b44a4ce7530f62ae…

MALICIOUS

PDF

71.4 KB Created: 2021-09-15 17:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be292f1c35f6447f3f0166b714d02b0b SHA-1: 508db887c84bebb29c84103bff86bfec4ffca317 SHA-256: b44a4ce7530f62aef341928e9a332119525fc06e26ee782b3d79ef566f9ad483
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable hosting and link farms, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://pistant.ru/uplcv?utm_term=example+of+a+real+time+operating+system
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141da5c1692c---sipogelafasuvojapur.pdf
    • http://newtrichur.com/userfiles/file/lovajisejinegadifati.pdf
    • http://ttfi.org/app/webroot/userfiles/file/gexewigavazatedikexar.pdf
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/27876940812.pdf
    • http://millecolori.it/images/file/wijajubixuwomijuk.pdf
    • http://cropscipublisher.com/files/upfiles/file/juboxusimudiwuso.pdf
    • https://wonwon.taipei/photo/file/difasenulotapilanan.pdf
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/wawotebe.pdf
    • http://szerecsengyogyszertar.hu/editor_up/26834967447.pdf
    • http://wccflooring.com/userfiles/files/63220305900.pdf
    • https://toocapen.com/files/18969126117.pdf
    • http://belean.pl/userfiles/file/12406177771.pdf
    • https://buzascsaba.hu/userFiles/file/tanaz.pdf
    • https://digireg.nz/upload/vowev.pdf
    • http://luxe-pools.fr/i/File/wuvimizile.pdf
    • http://ildungrice.com/fileupload/fckeditor/file/32249904397.pdf
    • https://medpressa.ru/files/file/vumopafokikatukubexuk.pdf
    • http://myapartment.de/web/editor/files/37316962359.pdf
    • http://megaprestige.ru/uploads/files/1206081314.pdf
    • https://rubyyadav.com/nbloom/fckuploads/file/17704980668.pdf
    • http://leaders-adv.net/userfiles/file/jenepi.pdf
    • http://agilesolutions.in/uploads/xebozumag.pdf
    • http://jkbprivateiti.com/userfiles/file/48244366726.pdf
    • 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_off0000b6b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B1 16792 bytes
font_01_sfnt_off0000cec3.bin
a97554e6e2bd067595c3187c9a0f61dfe9510d1e04a91706928608cecc8f20ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC3 15640 bytes
font_02_sfnt_off0000f683.bin
6f32bf36925058f2ade25e34482849c8a4c6b988b91c3d9ba76efe66ab74b83f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF683 10900 bytes

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