Malicious PDF — malware analysis report

Static analysis result for SHA-256 b41c5a6f10b982a6…

MALICIOUS

PDF

81.0 KB Created: 2021-09-17 11:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2e90126a5e80b7281b665cefe7ad23c2 SHA-1: a62f6a731c8fb55aefe12b6e7293cd56b9cb8309 SHA-256: b41c5a6f10b982a6a5f2ac2be8d449b290e1bbcbfc7434b30da78fd2d21f507c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

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://inwebjor.ru/uplcv?utm_term=blackia+punjabi+movie+online PDF link annotation
    • https://jakspravnenapsa.cz/userfiles/file/fuzezesebodexojudiga.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210917_145134_144.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/7761910912.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/36151686792.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/taviji.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210915140832.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/87454528038.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/nebezaxumom.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/vejibarelivozugidatosovo.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021090711192873499.pdfIn PDF document text
    • https://codefon.hu/js/ckfinder/userfiles/files/78608786895.pdfIn PDF document text
    • http://farashimirooz.com/files/87458304547.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/jupalozusifisi.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210913130308.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021090400102473499.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/felajuwamijawerabasat.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/20398218829.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/rexivepuzi.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/70553393395.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///44046171196.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/jelometujejele.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/83503956277.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/bedojezirudifeg.pdfIn PDF document text
    • http://kidzcastleschool.com/singhania/downloads/file/fuxomuxevivinidefagiro.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac7d21eba9---resurujegevevawasod.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_off0000d983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD983 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19A 10748 bytes
SHA-256: 075441bc06645f7ee66df39d41bad5843c291569a52224316e351599236efc8f
font_02_sfnt_off00010a0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0D 17272 bytes
SHA-256: b094cd0f7d19d3e27f212c316475f4be173ade41fff1b700425ce83ee07a4793

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