Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7a262bb9498cefc…

MALICIOUS

PDF

83.3 KB Created: 2021-09-12 02:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f99bd020c15477a0231de01fb8500021 SHA-1: 503deb0f2f4e2a8c69d596323ef88a88a2d1c9fe SHA-256: f7a262bb9498cefc4c9328e7864146d2760390db90ef5da059610990d1a761b5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://jiin-torng.com/uploadfiles/20210911092703.pdf In PDF document text
    • https://saikekanglun.com/filespath/files/20210902155512.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/somomuletufusinamij.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/43712371764.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/1502244021.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/venarudawenubaro.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/17958012622.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130e825288af---99279371889.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/maxasetelajaluj.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/58383650958.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/83784701968.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/3316249275.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/silol.pdfIn PDF document text
    • https://jurvamartin.com/userfiles/file/3144160707.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/161352a9ee6c3d---zoxem.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/xamabade.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/temipajos.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/1568241968.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161307419bdc93---pewefizaresovesiraxopisor.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/25975358952.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/54262799398.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/zokufe.pdfIn PDF document text
    • http://radiopoint.cz/userfiles/file/nofoforadizanulovimono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=total+commander+android+full+apkPDF 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_off0000dd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58F 18764 bytes
SHA-256: 7172bc88126c6d80c6fdeae47be57ae7c08bf5fefdd97e7442d54184fca75526
font_02_sfnt_off0001269c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269C 10768 bytes
SHA-256: bf96abfa04b021efaaf885519d8f6a79ff891d086259b838f12c55c58407c043

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