Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c5834100b5de115…

MALICIOUS

PDF

80.0 KB Created: 2021-09-20 02:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 060b3c4e161745675d8ca2f4d0d20dd7 SHA-1: 0cdd364a988997404a4862d446d153dc8b262b11 SHA-256: 0c5834100b5de115bc2d8626a0b9818e975bda38463dee3fea79c932100d4ae4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically indicating phishing and trojan characteristics. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to distribute malware or phish for credentials. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy of using numerous small PDFs on disposable hosting to obscure malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

Heuristics 5

  • 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.
  • 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=adblock+plus+browser+apk PDF link annotation
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398c3f3915f---bujonuperudoguna.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/19216303660.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/waposisona.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/54265405790.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/54644218239.pdfIn PDF document text
    • http://teedinmaesai.com/user_img/file/wijobetalejawol.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/mamelilapixeja.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/33726481919.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/93074194103.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/xenawokenizumegom.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/40344239151.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/fowogeb.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/99570247840.pdfIn PDF document text
    • http://4bx.pl/public/file/93636942450.pdfIn PDF document text
    • http://cochemical.com/upload/files/65708017178.pdfIn PDF document text
    • http://juentai.com/userfiles/files/vozonoxinuzibo.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/vitejinodakojorij.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/83003120944.pdfIn PDF document text
    • https://lapakunited.com/contents/files/jopapajegofubijenedazoren.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/20068572021.pdfIn PDF document text
    • http://micruts.org/userfiles/file/51651977190.pdfIn PDF document text
    • http://boxethai38.com/upload/file/padixobasilogebigufogovi.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/vanosorerifa.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109111857553555.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E9 10612 bytes
SHA-256: e1741b5cc496efbe50f80d7a7da296ee84afc8b3f2fc1487529903bfd4016ab6
font_02_sfnt_off0000eb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB28 19652 bytes
SHA-256: 280f7a14a57040a639af998f6df648e741f8fe8a19c7edbe707ff67a2916a846
font_03_sfnt_off00011c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1A 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d

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