Malicious PDF — malware analysis report

Static analysis result for SHA-256 a34ac026e63462f1…

MALICIOUS

PDF

69.4 KB Created: 2021-09-30 11:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4b8b4b775eabd706d90fb68bdb33f08c SHA-1: 3d9765d5a87f040c1941d14549b10216af3c8e57 SHA-256: a34ac026e63462f194ceb72cfebadae22dc2801bf069ea657da3d01aafd2d1ee
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple external URIs, indicating a malicious intent to redirect the user. The heuristic 'PDF_IMAGE_LURE' suggests it's an image-based lure with a clickable action, typical of phishing or malware delivery. ClamAV detection and ML classification further support its malicious nature, likely serving as a phishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://crysiq.ru/uplcv?utm_term=top+10+best+offline+games+2020 PDF link annotation
    • https://strefaokazji.pl/uploaded/file/zifirexak.pdfIn PDF document text
    • http://guapa2.com/admin/fck/file/67138799843.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/35721739321.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/18064295113.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/gemozibeva.pdfIn PDF document text
    • http://mps-india.com/userfiles/files/gokobanujoxule.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/dixemijizavidoze.pdfIn PDF document text
    • http://scantech3d.com/files/totuzigofo.pdfIn PDF document text
    • http://belst.by/upload/file/bulajetujasejaluzavujifix.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/lovoxesatip.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/72409284439.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/dewowo.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/zalamu.pdfIn PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/kobinunesigutata.pdfIn PDF document text
    • https://12tiga.com/contents/files/60448238461.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/tobevosorika.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/95634835307.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/16201538219.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/7f0c26bb5165fac30e7f890ba0a6c77f/nifemurilazenoguxaxan.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/zudigorajafigeg.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/buzuzavi.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/18077208333.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/99571002787.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/wimiporujenejetagekaguvit.pdfIn PDF document text
    • http://dd-eng.com/files/files/jonegapavuburuvunadogibo.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0ae5c1c50---20743459312.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/wagoj.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_off0000b1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E1 14464 bytes
SHA-256: 03e037edce8adbf218447f1db46f8c05d2212258163cee70b7d7875a4d2eb69a
font_01_sfnt_off0000d62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE44 10996 bytes
SHA-256: 558c81fbb23065dc7a259436f91ff0a0a7ee8284f9d7f31b39cdae73b13d57b5