Malicious PDF — malware analysis report

Static analysis result for SHA-256 389137dfb22c5c06…

MALICIOUS

PDF

81.9 KB Created: 2021-09-18 10:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 77f10312ee82987d9f5a3b6cbbac90df SHA-1: 91bb315aafd051a59893e403d3b10e90c54abb53 SHA-256: 389137dfb22c5c0699e47ecce2f141998a13f799bf3078ee0d0c2eaa13edffc6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for delivering malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects to one of the numerous external URLs found, which are often used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=condition+zero+android PDF link annotation
    • http://domosplast.hu/files/file/gapakigitapa.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/vemaje.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/b8cd6394d6f204c7d97852fac418c19d/timuxerojoriteta.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/7302335538.pdfIn PDF document text
    • http://reichspfarrer.sk/file/xisanelimalasufe.pdfIn PDF document text
    • http://fteq.ru/files/file/89841245265.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/pizija.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/gepoxiveruzimi.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/64426166615.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/19432039325.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/78171127003.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/96675024568.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/dulejuzizowanomasab.pdfIn PDF document text
    • http://full814.com/upload/files/81981489027.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210905_215230.pdfIn PDF document text
    • http://scpt.it/userfiles/files/48583802919.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/xukaxiva.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/46955094334.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/53215155306.pdfIn PDF document text
    • http://kdekdyjak.cz/data/57661472915.pdfIn PDF document text
    • http://kalikraft.com/images/file/vawuzedasejazutopudiruf.pdfIn PDF document text
    • http://packamate.com/userfiles/88383939090.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/94506109321.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/guxulesasiwetozamomaju.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_off0000d9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C5 18740 bytes
SHA-256: aa74652b9a26ec9b902083f11f1f057db1a76ba161741fcd9add6aa60369f537
font_01_sfnt_off00010b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0E 10120 bytes
SHA-256: a41ee8ae87b1471dbbebad67bb550fe038517699bf83dc332d6475d102d2a8ac
font_02_sfnt_off000121d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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