Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c6247305e6deeca…

MALICIOUS

PDF

71.2 KB Created: 2021-09-27 12:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c7410fd9d86e0b5bb821db4395a2c644 SHA-1: 395f93540fa40e07356374b391864810250a964b SHA-256: 8c6247305e6deecad8b205cf2647cffa47b58ac8610d9397634f7a5cd07dc0a6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm structure. It contains numerous external URIs pointing to potentially malicious or phishing sites, suggesting an attempt to redirect users. The presence of embedded JavaScript indicates a likely mechanism for executing malicious code or further redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 https://infrive.ru/uplcv?utm_term=all+web+series+free+download+apk PDF link annotation
    • https://bhiringisamsankalimandir.org/userfiles/file/9383834696.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/67797005472.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/zoninokopukutoxuw.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/reduxofaxuvazunod.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109251404308482.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/wumimagotiginatin.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/24734310755.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/33920143570.pdfIn PDF document text
    • http://huiking.cn/uploads/file/090446439789.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/boxeropedebev.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/zuredoweluvowitogapibo.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/lirupikowigal.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109040120523572.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/jawig.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/67662937488.pdfIn PDF document text
    • https://sergiomauri.com/images/file/pevejojuna.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/disut.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/14318829364.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/26218078392.pdfIn PDF document text
    • http://chinalabware.net/d/files/vogebegujarivatam.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/57353236511.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109261612097196.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/60029281107.pdfIn PDF document text
    • https://ycb.one/pro_pic/files/navugegozevuxag.pdfIn PDF document text
    • http://rc-modeller.se/images/file///vakurezin.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/63558769510.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/dinigumarezeluna.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_off0000b4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C7 16200 bytes
SHA-256: 6b9c369e77762e1cc993691115fbb27aa866951011eb61602a67413601c1ec0f
font_01_sfnt_off0000dd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55E 10692 bytes
SHA-256: 91d89e92610aedebe768efaacfdc2aec7169441abc6d47f0e9eb72a655db4b94