Malicious PDF — malware analysis report

Static analysis result for SHA-256 8918a9ea0d0968a0…

MALICIOUS

PDF

68.0 KB Created: 2021-09-20 23:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5e33f018430a6e4a62450fbff62603a9 SHA-1: 6c46d029053e928b32d6fdf93e087e9ee656672f SHA-256: 8918a9ea0d0968a0af98054376648cee1a0bc42dcd10de6f7c56c6a8b6b5e59a
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and an image lure suggests an attempt to trick the user into interacting with the document, likely to download a secondary payload or redirect to a phishing site. The numerous external URIs point to a link farm used for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 67 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://infrive.ru/uplcv?utm_term=how+to+download+full+albums+on+android+for+free PDF link annotation
    • http://soluzionebenessere.eu/userfiles/files/xizirexiz.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/41633775769.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/56025675333.pdfIn PDF document text
    • https://mkontroll.hu/File/nutazuwerebanogilonepilum.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/wanotafajoge.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/vuvavupetusumomevu.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613390f423725---81879155430.pdfIn PDF document text
    • http://abworder.com/uploads/files/19944428984.pdfIn PDF document text
    • http://wmsone.com/eimages/file/14897001010.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/dukujobemejaxebutokelo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a83056d44---22601857995.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/60211530062.pdfIn PDF document text
    • https://0900107678.com/upload/file/susuwijupodufamunamo.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210917175000.pdfIn PDF document text
    • https://isosklo.cz/uploads/nimeti.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/tafakibusafodif.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/lawizuzaxitaju.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/tilidiraru.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/78414499309.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/79491800262.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/nejexideke.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/bavofazikuvaxejatuluz.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/32209153351.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/324612819.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_off0000ae86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE86 10832 bytes
SHA-256: a8726b58143d81f4ec298d4a3f53744abc6680edc0f14aff59c2d1e856af810f
font_01_sfnt_off0000c786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC786 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF98 14036 bytes
SHA-256: 13b0edee925955728f93db1b6a695abd1e7fe68bd7dd860d7ccd2aa71a860183