Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd560eb8f492e6fc…

MALICIOUS

PDF

72.6 KB Created: 2021-09-13 15:32:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6b4d8cee01271570f27b8b017dfb2372 SHA-1: cf1f5dbc69d36a92a759fc18f14be5ea91efb54d SHA-256: cd560eb8f492e6fc19c6a09b2ebca1eca00b369ac82342ae1c0ba00c0b978058
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links to potentially disposable hosting, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a second-stage payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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 http://tnslib.tools/userfiles/files/54384823041.pdf In PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/73315841878.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/13456111623.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/lojumegalatudetivuzob.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/jasinuvalojakumijosedaf.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/vomikepeninazofeno.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/ec9a7b312648ac326c9ba7ec837718ac/90928629254.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/tisifajaditodumopereku.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/76863680472.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/rubunotatomusapanozako.pdfIn PDF document text
    • https://tigapilar.com/upload/files/vegilifiwotilu.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109030334172244.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/nuxusabefowato.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/t4usn1770utjsci53ht8b5m655/zuwibabosiromod.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/sugalaratolugovurife.pdfIn PDF document text
    • https://dcicz.org/userfiles/file/salekemekotibevevino.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/38923960312.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/73416172833.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/vaviseg.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/55151481614.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/kikitukabinisefukonitor.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/kezusumufevekuk.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/nunuvoxatutif.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/tefozikukim.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/wogawikopowe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=gta+weather+cheat+pcPDF 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_off0000bc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC09 16416 bytes
SHA-256: 3786d05ba96101d7eb01c4a9f4444dc62c655ae89ffcd48d3d27c1a1bdefe3cf
font_01_sfnt_off0000e5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F0 10064 bytes
SHA-256: 71106f77d33cacc54bc3ee9e19445bd92cee684d1c4c1431438528e85c75b8a6
font_02_sfnt_off0000fc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1