Malicious PDF — malware analysis report

Static analysis result for SHA-256 a89dc2fdbe6fb7fb…

MALICIOUS

PDF

79.2 KB Created: 2021-09-17 06:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0947bb06bcbd083e9886f29fba48a496 SHA-1: 5bdf13ecbcf5c1c2f8f015f6b7994b08e6811920 SHA-256: a89dc2fdbe6fb7fbe145d3259ac6165167ef25daf100783028ddfe5d0833bae6
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of external links, suggesting a phishing or spamming operation. The ML_NYX_PDF_MALICIOUS and ClamAV detections confirm the malicious nature of the file, likely involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://stavclearing.ru/upload/files/95268273566.pdf In PDF document text
    • http://madmojo.com/fckupload/file/92888893631.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358ba8f0588---vikeneboji.pdfIn PDF document text
    • http://metabolit.ru/files/file/47070266321.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/panibibepibunerapemesig.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210903180821.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/69306887689.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16139414beb6ce---69247321677.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/nuduwixavevujegulazikebab.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/10329354858.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/zipemagikijitazo.pdfIn PDF document text
    • https://ikorti-iao.com/userfiles/files/tebimojuxobejawijofulitox.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/rumixomulalopet.pdfIn PDF document text
    • http://jlssj.com/qianzi/upfile/case_editor/file/77292533011.pdfIn PDF document text
    • http://markone-tools.com/upload/files/sejuwire.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210917061748_627547039.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/zajenajuxeduwamuwe.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/mopajobadubopabazawa.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/ziziraz.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fefe46d8f9---fodizaxofegazifirajerox.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/pudarapejilaneral.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/83428188107.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/24460337968.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=object+oriented+javascript+pdfPDF 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_off0000d36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB80 16604 bytes
SHA-256: 73c7933a9d1d11485e1e969a9ed76e2db682785fcb7fe6ef588c1a321bc26ef7
font_02_sfnt_off00011637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11637 10928 bytes
SHA-256: b2b6d80a713e1c231c115d9276f0db4c30c8140da6bb4d40dbbb6726098f3b73