Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c14ed43026f8504…

MALICIOUS

PDF

73.1 KB Created: 2021-09-24 13:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6279655fd00b2fd21e584ab9d08833ba SHA-1: 05adcd9349d9bae6ea0f0ca4fd9ba3e67fbf189c SHA-256: 8c14ed43026f8504e16a0e7501f2fce8deaa1f2afc23e8401c37ec8515937ddc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are likely part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript is likely used to redirect the user to malicious sites or download further payloads.

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 http://schubert-hh.de/image/file/50173016692.pdf In PDF document text
    • http://sor1310.com/userfiles/file/97349710133.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/53830617553.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/jujaroto.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/6833033670.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/zirupugukigakagoriniz.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/lojuwonapubik.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/24143950064.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/8964645770.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614021610d6b4---pejinukutepegusava.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/71823883225.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/32721035162.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/bujexuluv.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/xewawibumelorodajakifi.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/siletodogulaxunojawuditaz.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/danolerojenanadu.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/fulapabilenizolugum.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/61706068274.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/vaxipuxowawapinatol.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/14925518440.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/d9d182547a075047e3f0079378f23afd/duwowuvewinijuki.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/dabili.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/raziluwojebibetexugale.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=new+practical+chinese+reader+3+workbook+answers+pdfPDF 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_off0000b340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB340 19076 bytes
SHA-256: fd0ce0f839017e57d13ad4d336d5a9d278d0112813edd985bc6e5aebda467d99
font_01_sfnt_off0000e4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC2 11184 bytes
SHA-256: 74ddad5cae642d437ef39c20f6aa2ef26c5ef08a1444b094bfc05c6c151250f8

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