Malicious PDF — malware analysis report

Static analysis result for SHA-256 612844de82f27545…

MALICIOUS

PDF

82.9 KB Created: 2021-09-18 21:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7618b1c8d450ac9f01da022eff275e09 SHA-1: ee6c2c503280338b72fad27567d7897d28e0286a SHA-256: 612844de82f27545bc2f0befa829dbee0f434c1cfa308e65c18d2ea612a44a68
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. ClamAV and an ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics suggests the document's primary function is to redirect users to potentially malicious external sites, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://drafthe.ru/uplcv?utm_term=motorola+droid+turbo+hard+reset PDF link annotation
    • https://cissud.eu/uploads/ck_editor/files/nigogos.pdfIn PDF document text
    • http://ivanda-commerce.hr/userfiles/file/zijuvubawupexukutexino.pdfIn PDF document text
    • https://ayurmitra.com/files/file/38455899565.pdfIn PDF document text
    • http://eko-uklid.com/files/file/zubetuposeso.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/86335711798.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84229848652.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/31146653068.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/61383767922.pdfIn PDF document text
    • http://0228339500.kad.tw/kads/ckfinder/userfiles/files/13747675538.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/wudobikuxokewuwezabe.pdfIn PDF document text
    • https://artenika.pl/fck/file/26596270063.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/fosovoxituzexotexen.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/kodejedusumafikogif.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/27127960675.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/jususilizegonom.pdfIn PDF document text
    • http://riph.pl/userfiles/file/27413846774.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/nudopu.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/59558478812.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/45795504428.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbfe91dcfa---xoman.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/tivilorovabo.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/1b9053a6b3ab238950517c6ee42fc38b/nivuropowozok.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/1595316862.pdfIn PDF document text
    • http://aprt1day.ru/file/86679797355.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_off0000df21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF21 10472 bytes
SHA-256: 7f415ea06b36a919996af0aa846c23a6f329249d1c0d48e667fffd63e1a5dfa2
font_01_sfnt_off0000f70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F21 18348 bytes
SHA-256: e473c8edbe6ce8f5492f642e5f33b8702cab003201381b66a1e7931a5b6187e6