Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a412d541213346…

MALICIOUS

PDF

79.9 KB Created: 2021-09-16 14:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dfb26bc5d33b2bca39a2be865bea07a3 SHA-1: 528842b92b2bbad4f05480cf815af87c308ea731 SHA-256: 25a412d541213346936883a3601ae9159b34dec3c4f3c48d2d3fdeac8a899676
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, with one heuristic specifically identifying it as a 'link farm on disposable hosting'. This suggests the PDF's primary function is to redirect users to a network of potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=ppmv+to+mole+fraction PDF link annotation
    • http://tysons-cafe.com/uploads/files/30391155329.pdfIn PDF document text
    • http://gucaoyun.com/uploads/file/101316568056.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/finopurodasib.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/xuvagejajagubowol.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161306de3b0b11---xizebutewuwidamatig.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/61397177524.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/40120456380.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/jubefut.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/bilulabiginuw.pdfIn PDF document text
    • http://bscartridge.com/pic/vadojomogefuze.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/14583574961.pdfIn PDF document text
    • https://beautydent.hu/editor_up/deruwederufigewun.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/1241844061.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/38577070341.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/48926130318.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/piburibepebajamumobus.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/tfo741f53kd8qecsmj5h287k43/madimuj.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/70460186585.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/fceb814172d57bfe2d767c343f106190/pexur.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/27489208418.pdfIn PDF document text
    • https://akvaguru.hu/user/file/jijelogaziwolovojonopa.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/61806724323.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/69870204348.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_off0000d262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD262 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA79 10540 bytes
SHA-256: 8df3c862cf7c691a909604d78a81c79b3a88b2a70f2117a65dab19360c7102bb
font_02_sfnt_off00010273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10273 18424 bytes
SHA-256: 1b99bf1b11c8d7ddbf7a515868277486a5031d418d17e06e3332bb207c0be342

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