Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f6f91cacdb9e4e6…

MALICIOUS

PDF

80.2 KB Created: 2021-09-14 00:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8e05b745e7b13d0b36846c64e5c2d3ca SHA-1: 45b454e50707d5bcdb6b3dfbdd4f51b0383233e1 SHA-256: 4f6f91cacdb9e4e60af421eb3de28ce7e707cd6dd2d3ae17745bfbf44092da55
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://conexus-study-abroad-travel.com/ckfinder/userfiles/file/80076360684.pdf In PDF document text
    • https://1tlstar.com/storage/uploads/files/tatajizapitazarakad.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/83269666099.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/bojexemizavop.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/80058756524.pdfIn PDF document text
    • http://weingut-suppan.at/files/kidemuwen.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/21299846190.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/fatelowalisinepa.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/bifiwamuk.pdfIn PDF document text
    • http://devison-matras.com/upload/file/jamebibovurobedalini.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/46789171571.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/49118711177.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/17687944546.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/9590791670.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/miwipo.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/29321698689.pdfIn PDF document text
    • http://effektfilm.de/files/file/80247318890.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368ec666650---58635025602.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613558ddf0377---jeweresufoxo.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/vijebalisesowov.pdfIn PDF document text
    • http://rayanchem.com/d/files/gejibagaraw.pdfIn PDF document text
    • http://ilovestory.com/upload/file/dumozazami.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/xizilapiwurugaxaxi.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/69568099427.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/45531117221.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/kafekalolit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+set+your+phone+ringtone+to+a+songPDF link annotation
    • 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_off0000d692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD692 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA4 16684 bytes
SHA-256: 8b1f432155cc4a87d191c2d59773574097efb25e32fdfbab7751bf3c2ad41c95
font_02_sfnt_off00011a1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1C 10776 bytes
SHA-256: 413b9fbea65151d1f24a68590d55e9a25c42d0842f70d90e5bad0b4c2b292919