Malicious PDF — malware analysis report

Static analysis result for SHA-256 40dc065cf8b43cd5…

MALICIOUS

PDF

83.4 KB Created: 2021-09-10 05:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 9e2e71b7476bb84f575b2cb9e5980022 SHA-1: 8f6f374de09dc7c627fc4ef6e72535f9d9082692 SHA-256: 40dc065cf8b43cd564d5d975edf6c753eafc56b8df27536bbaccd45f9f5fb64d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=lcars+47+android+apk+download PDF link annotation
    • http://joltiy.ru/uploads/files/tawip.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/34994616615.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/siwadidezitonixezarulimo.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/79051035160.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/22103779358.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/fatefepejenimageso.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/lonilumelasetuwepabevot.pdfIn PDF document text
    • http://schubert-hh.de/image/file/falozagadiso.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42883038579.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/mawopedunixonarex.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/livusawatomo.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/medidixoroj.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210910063435.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/37788321470.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/dadenajunumudufifuxuzodo.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/55512647302.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/dozixalidixa.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/2309272589.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/55705268394.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/vuziba.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/gudelemo.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/fuxewu.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/3468054183.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/75375349540.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_off0000dd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD76 10540 bytes
SHA-256: d821b638ea1f4bcf7085f66e2ed69501de56da2fa704011295750355b8db1972
font_01_sfnt_off0000f5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC2 19020 bytes
SHA-256: d8d56dcce5a0ba8b3087040c31d6fadf551c3ff33d50f5f73852f3147796271e

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