Malicious PDF — malware analysis report

Static analysis result for SHA-256 42d15cb47ea9a690…

MALICIOUS

PDF

83.3 KB Created: 2021-09-17 23:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ae0cc27177e23ca78eab35ea3af1e32a SHA-1: c4df616c5b5f094ca96baef488ed03b3da583bc8 SHA-256: 42d15cb47ea9a6909ffd76e4f4d9ce5fa7a4aa43c99a701de088f43ce703d020
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect users to malicious websites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggests a link farm designed to host a large number of potentially malicious or phishing links. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=can+i+stream+die+hard PDF link annotation
    • http://yonezawanet.jp/units/24250/zcycom/files/dazikefowovaboto.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/52372683834.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/jifunodofikivadudimegi.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/nerigiza.pdfIn PDF document text
    • https://negaratoto.com/contents/files/werizoriwotawazajasita.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/nobuzesavo.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/lejiv.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/63548850961.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/21941563136.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/74171725830.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/78379975888.pdfIn PDF document text
    • http://kes.org/upload/editor/files/59484678473.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/29391089337.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/10748032748.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/68023569025.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/20570626233.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/tezukubumokifedi.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/vinudaw.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/sajoken.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ee1e0bd61---78291181968.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/miluv.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/e8864f5c381ba86b8b5856ae18ad9383/tafiwif.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/56363676933.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/toneripegewuwimududefed.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_off0000dede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F5 10376 bytes
SHA-256: 9a20d8abe60e6019824ceb41b13feb675c21664a5fb3fc3c3612603bcb8dce89
font_02_sfnt_off00010e38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E38 19352 bytes
SHA-256: 1f3e2eb0f40c2027df791a9930c87d2781fab3cb777d8906c95bf7533bd87c0d

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