Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca282972cd467658…

MALICIOUS

PDF

71.8 KB Created: 2021-09-18 07:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a0004fb5cf09a789170cbf49e079eee3 SHA-1: 98dc1d98c7118d5fae49ffa9b1a9c561fef598aa SHA-256: ca282972cd467658a5d9651eedc6c48275ad69a4cc5fa08a050a99362c79646d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, common in phishing campaigns. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an intent to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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.
  • 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://huntic.ru/uplcv?utm_term=jagame+thandhiram+tamil+full+movie PDF link annotation
    • http://fanti-fitness.pl/uploads/assets/file/63495869094.pdfIn PDF document text
    • http://fk-fudosan.1nino3.com/app/webroot/img/userfiles/files/15592641602.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/34957012961.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/musofuguzojolerekolofimis.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612faaab15e13---57860403225.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/54201520534.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/45380703771.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/95944865578.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/sekitajulikobarokifemerep.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/gamudomudawugexuxisebe.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/nusukir.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/17979133956.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/mosepiz.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/giwobebowinat.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/61893919465.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/surobisalonudekevome.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/tiremotu.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/jijomujadepab.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ba02b0f8d---58515234783.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/11674756611.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/34013077858.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/40226566851.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_off0000b752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB752 10792 bytes
SHA-256: 9318da05e36c05518f987ef63aa312d1928adc004adb093a32a5ddb1ed01928c
font_01_sfnt_off0000cfbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBD 16320 bytes
SHA-256: 1c502d9264e8edf2d44fd644295358b4c5ec8cffb7cc08a17b4dbc764f684456
font_02_sfnt_off0000f9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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