Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dc63009ed415c16…

MALICIOUS

PDF

72.1 KB Created: 2021-10-02 17:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 100cffabaea5f156050964e9b4496a26 SHA-1: fa21d4a8849fae140a05ab7a05b3cbe3a9738205 SHA-256: 2dc63009ed415c16531fb6da24f5c0542f37a94dbe20ec192003cea20de2d510
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, with heuristics indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with spearphishing attachments designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://huntic.ru/uplcv?utm_term=everynight+in+my+dreams+mp3+download
    • https://cet.sk/res/file/60933346998.pdf
    • http://pibar.tw/uploads/files/202109191018025563.pdf
    • http://cungcapbaoduongcuanhatban.com/upload/files/julexufaxeg.pdf
    • http://sahcarpets.com/userfiles/file/fimodipidufuke.pdf
    • https://duel.pl/userfiles/file/segorigaxezerolakufugeru.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615846c8a1d54---11365561026.pdf
    • http://rockefellersgold.hu/editor_up/45994797241.pdf
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/taxas.pdf
    • https://bloomeng.com/uploads/51292682501.pdf
    • http://hkalc.com/userfiles/19254212247.pdf
    • http://rs-entp.com/upload/file/92338875298.pdf
    • http://belly.bpv.su/content/files/files/vapivawuwotusak.pdf
    • http://siltukai.lt/userfiles/file/sobazonakoxipavap.pdf
    • https://licorne-hotel-restaurant.com/userfiles/file/vukufiwawugumixetoz.pdf
    • http://edallyshop.com/upload/files/segexerejejunelabo.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb66ab1a57---47265031840.pdf
    • https://marathonblainville.com/userfiles/files/40299158693.pdf
    • https://saigonservices.vn/images/uploads/files/95785499934.pdf
    • https://ladida.asia/sporlegen/administrator/imagetempfile/48780917610.pdf
    • http://zsmnowakowski.pl/userfiles/file/68961966119.pdf
    • http://merlegdoktor.hu/tmp/xowoguxupunib.pdf
    • http://www.nagsa.es/ckfinder/userfiles/files/10768293761.pdf
    • http://naturenhuman.com/app/webroot/userfiles/file/8670393391.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_off0000b054.bin
b9f3e127655e621fbcaecbd6c6406069926ef29e6c2045383abe44721c4eabfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB054 19076 bytes
font_01_sfnt_off0000e0ef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EF 16792 bytes
font_02_sfnt_off0000f906.bin
de084756862cff6b01f4cfbe8c02eaf5f605d26fa7e6026c48159138df55531d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF906 11260 bytes

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