Malicious PDF — malware analysis report

Static analysis result for SHA-256 426cd2f6c15ea022…

MALICIOUS

PDF

81.7 KB Created: 2021-09-19 15:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d04c9b64f041232715609617bb317177 SHA-1: 039930be397c6bc256ff4d433feb8763a2db0d4f SHA-256: 426cd2f6c15ea0226a05b0bf95dd6ba87b17080a727aaae684fb18b6cd6d2899
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, and one directly to an IP address, indicating a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://oniceh.ru/uplcv?utm_term=descargar+jetaudio+plus+full+para+android PDF link annotation
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614439cc6c917---puwesiti.pdfPDF link annotation
    • http://roycraft.ca/userfiles/file/giverit.pdfIn PDF document text
    • http://dobre-akce.cz/media/files/file/96001359874.pdfIn PDF document text
    • http://zamgph.com/uploads/file/190421194666.pdfIn PDF document text
    • http://singlesync.com/userfiles/file/33166586512.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/32826010619.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16144b8f425647---feretexiviwosowogafi.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/nifalusonitexipumulefuf.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/51098060361.pdfIn PDF document text
    • https://gopherscopes.com/userfiles/file/9604366175.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/virarudewoxoneka.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/91787486049.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/ragafiwozasinukok.pdfIn PDF document text
    • http://risme.vn/files/97065836174.pdfIn PDF document text
    • http://www.klccpa.com/userfiles/file/In PDF document text
    • https://karpataljaturizmus.hu/upload/8825387046.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/mevakuv.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/jusiwi.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/50651255022.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/64539151485.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/33646119121.pdfIn PDF document text
    • http://atya.eu/files/file/rekitunimagi.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161407a2513ff6---66573915344.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/85681189926.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_off0000d794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD794 18284 bytes
SHA-256: a93a19f889bbf0e503514156bfbdda96b1ee119c62fa3abca89c04a6c2b2bb08
font_01_sfnt_off00010728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10728 11024 bytes
SHA-256: 318bbd0735160849d51c7536f6f21ce5b43032ee3094d5d3d2bdfd2a72b727ed
font_02_sfnt_off000120b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1