Malicious PDF — malware analysis report

Static analysis result for SHA-256 56501f8b1e94883a…

MALICIOUS

PDF

82.7 KB Created: 2021-09-17 01:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 56f01c8300d240c0c9357095b856f205 SHA-1: 4987921cd558146cdfeab094a177587923feea8e SHA-256: 56501f8b1e94883a6dbfa17d7b360daf35d927d47621d92ca159258ac491fc29
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to exploit vulnerabilities or redirect users to malicious sites. The presence of a visual download button further supports a phishing or malware distribution lure. The embedded JavaScript is likely used to facilitate the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wastran.ru/uplcv?utm_term=gta+san+andreas+save+file+all+missions PDF link annotation
    • http://kurumakaitori-one.com/js/upload/files/72846413516.pdfIn PDF document text
    • http://wamer.org/userfiles/file/sidabivevax.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/15932749048.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/78232513586.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/35552978223.pdfIn PDF document text
    • http://wdnederland.nl/file/76048882473.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/jezevoxekizulepademafek.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/7195821062.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/zevewetaniwuzigolozuxe.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/lipuvitujepoku.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/sekikebebuje.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/lidojokodaduguju.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/32144662445.pdfIn PDF document text
    • http://geyuping.com/geyuping/uploadfile/file/2021091119514973499.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/nugoxubowasuwefepinuvus.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/mimifenujavet.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/161307a3a358e8---71210703208.pdfIn PDF document text
    • http://hajni.pl/userfiles/file/37928811551.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/xixozavajod.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/zofibosivoxokop.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/50888520917.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f30c1a2bc---3788216606.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/31161700218.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/50364786849.pdfIn PDF document text
    • http://ebara.com.hk/ckfinder/Zenith/userfiles/files/10795907068.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_off0000daf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF309 10620 bytes
SHA-256: 27e946d896705b82c7bb855a35a645d2d4bc42fd1899bf21bbedb64c9665298f
font_02_sfnt_off00010b5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5C 19160 bytes
SHA-256: 3daf0ca04d83a1e4fe5c697297f6683e8c2e8f76e78eb2d7cff5f78a8f870d5b