Malicious PDF — malware analysis report

Static analysis result for SHA-256 8712b28a4ecda795…

MALICIOUS

PDF

72.3 KB Created: 2021-10-04 11:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b1fd5e1b426a91368d36dc63324505d0 SHA-1: 4160e31a596970d7c262ef7e1d04213f31720eb9 SHA-256: 8712b28a4ecda7955358d74f3804aac27ba384c1bc6fde7a790474cd13b05f2d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, suggesting it functions as a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to distribute links across many disposable domains. No scripts were extracted, but the presence of external links is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://medvor.ru/uplcv?utm_term=puppy+throwing+up+in+car PDF link annotation
    • http://mutitar.com/user_img/files/39573836774.pdfIn PDF document text
    • http://fruitvita.com/files/files/20147919759.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/bidipobutelexowejememo.pdfIn PDF document text
    • http://simoncaulkin.com/images/14739379467.pdfIn PDF document text
    • https://cronos.jptecnicascr.com/yiicms/ckfinder/userfiles/files/rined.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/paripim.pdfIn PDF document text
    • http://a899.net/userfiles/file/27739870483.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/95902172832.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/161368c373b409---dumofarifazav.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/29ad73060efa50a789844a51a30884bc/sumesifug.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/22284201403.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/48375385891.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/vojadujolowilixu.pdfIn PDF document text
    • http://precisao.org/files/files/85987034601.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/felobejabovineligo.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/13808892357.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/jozirozos.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210918_054355.pdfIn PDF document text
    • http://touchpanelpro.com/upload/files/gajurowimikevesaro.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210916012305.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/43357855768.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/79617922095.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_off0000b7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B5 10608 bytes
SHA-256: 02c4ec9371598a846afe1c0665db12ddda4233d1299e76c32a9f35b1e5ea6f63
font_01_sfnt_off0000cffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFC 17176 bytes
SHA-256: b0166aad8aa1117d3b6effe15b06649218d4917725abca6328bf11b5499dd62c
font_02_sfnt_off0000fbef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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