Malicious PDF — malware analysis report

Static analysis result for SHA-256 731928c1354501b2…

MALICIOUS

PDF

85.3 KB Created: 2021-09-20 22:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fe30478da2c273ec31e2bb72634fde46 SHA-1: a030c940ce64ca2ecef682bc58e9f54b3fbeb13f SHA-256: 731928c1354501b2f5cd58a5d8c45ed59f522059a113ae3b6cfa3efb7cc37fb6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URLs, many pointing to PDF files on disposable hosting, suggests a phishing or credential harvesting attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://medvor.ru/uplcv?utm_term=best+android+chipset PDF link annotation
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/towimoruvi.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/milibonoxope.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/regerexate.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/47314797277.pdfIn PDF document text
    • http://rld-carbon.com/file/542636583.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/61595425173.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/kafotifixuzasuvedu.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/53828149716.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/ritajazurami.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/40736561195.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/tubij.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/ragasaz.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/9402912727.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/32455234320.pdfIn PDF document text
    • http://sial.pl/galeria/file/wazidovavajozidozavugef.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/xasamisazisodatizekiwe.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/nurizibepopogivadu.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/wasepomisewezala.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/37686939076.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/31703874861.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/71641368568.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/18421286524.pdfIn PDF document text
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/16992920567.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/miwizifu.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143f62579af5---91212035427.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_off0000e838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE838 18132 bytes
SHA-256: b3bef2977d5e7fb17c81dc58d556916f38c7a9a49b28ca42665506c1cc3af852
font_01_sfnt_off000117bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BD 10616 bytes
SHA-256: 947205ba0a94c977c8cec0de36abbdb00a3ed3ed013954f285f31daddff1fb3f
font_02_sfnt_off00012ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.