Malicious PDF — malware analysis report

Static analysis result for SHA-256 3376646f2c352fbd…

MALICIOUS

PDF

88.8 KB Created: 2021-09-14 08:19:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 40e450f4dfd32f131319df09f99c2389 SHA-1: b5a9864779193a9fc96224b933cdce3fb1d5c3a3 SHA-256: 3376646f2c352fbd37f7add33979473889a5232a77a6e0e5429b7401cf7613f7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are structured as link farms. ClamAV detection and ML classification strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://irlanc.ru/uplcv?utm_term=happy+to+watch+movie+full+hd PDF link annotation
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/nukexekajojizetenizugareb.pdfIn PDF document text
    • http://ingore.cn/upload/files/zobevoperali.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/35448118946.pdfIn PDF document text
    • https://zhansq.cn/upload/file/67542908996.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/17298696731.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/jepaz.pdfIn PDF document text
    • http://denetimmusavirlik.com/userfiles/file/16208971031.pdfIn PDF document text
    • http://egitara.com/upfiles/files/bezagenuzi.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/duduvigazesexo.pdfIn PDF document text
    • http://integrotech.eu/zdjecia/file/febivabikerelaxigi.pdfIn PDF document text
    • https://servicepapik.ro/files/25333693890.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137633c26ab5---zawozogazezusagozubamego.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/42e1sko2k5j0s6lf1e3bjj0ueo/80836974202.pdfIn PDF document text
    • https://udruga-invalida.hr/files/tavapadi.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/tewusepoboj.pdfIn PDF document text
    • http://kodemari.info/data/files/90871350944.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/boxegofura.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/32528356555.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/jatapifokidebajezuwedowi.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/65589840095.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/bosavegimilebifoxo.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/vomerulobutade.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/95568188351.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/64810490222.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/zejotarogudarowolesak.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/58591669336.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_off0000f7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AB 17520 bytes
SHA-256: 19d0307110f114c6a57b0ea360c3bc230bc2ce647e13460b14feb73fec9b9662
font_01_sfnt_off000124b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC8 10868 bytes
SHA-256: 768e6e3a13c0baacca6bb48c7c438fa4d6b40c18a5c5864de6087e24cbeefd2c