Malicious PDF — malware analysis report

Static analysis result for SHA-256 247bdac70887911b…

MALICIOUS

PDF

70.2 KB Created: 2021-09-16 21:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a7b8bec5e0b1d4f1761870297072fd40 SHA-1: 598604db59f755747dc3deac89ccecac9f36e75f SHA-256: 247bdac70887911b40908077de9ca63e71ba9d9ecaa949f0cbcffbfe31a8c830
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs pointing to disposable domains, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the attack pattern of using link farms on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://laborke.ru/uplcv?utm_term=derivative+of+exponential+function+formula PDF link annotation
    • https://intekcanada.com/ckfinder/userfiles/files/jegavomazevawin.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/kasosabagub.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/63216901608.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/mabodotar.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210901_132237.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/taruvetuten.pdfIn PDF document text
    • https://goodline.by/userfiles/file/botegurufela.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210915_101220.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/88122797796.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/41571519132.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/budadekurazulimofosew.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/pivipujowubulukago.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/1h9o1vpvlne7fe9cjlqvijl67m/visajokowikevewigekufo.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/silolijokig.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/28663445906.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/lezisiruz.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/b346aa9060e39a547d4aff37b9797792/63562569420.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/10762844278.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210917000223_0trjca.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/16734318150.pdfIn PDF document text
    • http://unityproductions.com/upload/files/41820760566.pdfIn PDF document text
    • https://allora-tour.by/var/upload/file/komese.pdfIn PDF document text
    • https://kimcert.com/E/file/farak.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_off0000b06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB06C 16588 bytes
SHA-256: be924e5d30f4fdb4f36f1cb8462a1b3f38c343fa949205ca48530a6cd86eb359
font_01_sfnt_off0000daac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C3 10744 bytes
SHA-256: ee985bcbf5f4198894a3a8dc4a60187fca15879b4c6e3896d55aa44812016925

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