Malicious PDF — malware analysis report

Static analysis result for SHA-256 a99181100dfcdc3d…

MALICIOUS

PDF

75.0 KB Created: 2021-09-10 08:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ab31c4f532a824df2cb23f02fc41c79f SHA-1: 2b3c3ee60746415cd6a2e808542cbad25d6fab0f SHA-256: a99181100dfcdc3df9e73d0774b179bb0d158c9b01fcc1d659307f0407e14bf8
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 are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript is likely used to facilitate these redirects or obfuscate the malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://cructi.ru/uplcv?utm_term=romantic+shayari+wife+ke+liye PDF link annotation
    • http://njbeihang.com/uploadfile/file///2021090523545839.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/dixisojunug.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/rubaw.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/dovijufigamaxasevajar.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/5841bba46c3027e93315b8842cd71e34/vuxatiwafuzo.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/fivopemegine.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210908212337.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/fususuzil.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/juzavuwuvi.pdfIn PDF document text
    • http://lscapital.it/images/file/8096431895.pdfIn PDF document text
    • https://terracell.pt/images/file/firerikurixodajoreb.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/rakojudulajunuw.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/roxitiveleviduzojurir.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/74724351315.pdfIn PDF document text
    • https://polandpools.com/contents/files/devoruwo.pdfIn PDF document text
    • http://mastervin.ru/files/file/14600362524.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/wigaruzerutabofotibik.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/34280987967.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/8692187520.pdfIn PDF document text
    • http://salt17.com/userfiles/files/lisefavegokejutugupidojam.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///43712071832.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/jojetuzizaxelejujujizutej.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/suxox.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_off0000c02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC02B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD842 10936 bytes
SHA-256: 159189c0e411ee72a42963d7e68c4eb1713854470232d12cb5050731c650fc67
font_02_sfnt_off0000f189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF189 16752 bytes
SHA-256: 1559f4c9952f4793a609398790a3dc407049eb22072b292aa976b891c31a35c8

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