Malicious PDF — malware analysis report

Static analysis result for SHA-256 2136041d931af1df…

MALICIOUS

PDF

80.7 KB Created: 2021-09-09 11:25:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: c375b5160511a4d1e7544ba970770a3f SHA-1: 48d6ae85bdaf51c83d4976afef3a40be94c4eb1a SHA-256: 2136041d931af1dfd72b4310810a40a140d6aac3bb5e12c59a2afa8fd02c7b03
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 0.9972

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://medvor.ru/uplcv?utm_term=pokemon+ash+gray+game+download+for+gba PDF link annotation
    • https://leciv.fr/uploads/FCK_files/file/lafolawabatonulitebuxax.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/zomaseja.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/49496291664.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/fadanilonivalis.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/naxeroxufepidotidefu.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/59739417229.pdfIn PDF document text
    • http://pointwebhost.com/calisma2/files/uploads/kobefavegabowiri.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/78803881494.pdfIn PDF document text
    • http://linker-apps.com/files/koxalawubemofukefoge.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/telifikijelesadafetaz.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/44678514692.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/59427458805.pdfIn PDF document text
    • http://rc-saty.cz/gais/image/file/dekekinajunenepovabezefog.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/zitoderutemuselevabagago.pdfIn PDF document text
    • http://pasted-radio.de/web/files/zemamajunimarilisuxelum.pdfIn PDF document text
    • http://thcsnguyenvanhuyen.hoaiduc.edu.vn/ckfinder/userfiles/files/vomaxi.pdfIn PDF document text
    • http://someteme.com/archivos/_20210908201829.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/mimegifuxivulafonut.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/78034922881.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/99138989962.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/96683409766.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_off0000d66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7F 17572 bytes
SHA-256: 32798a4ee2670b0ccb59cff4e805ce8f36505ec6fbcae49ec6c2440b84f22bb3
font_02_sfnt_off00011c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C36 11044 bytes
SHA-256: ad0d5f4dea19c55d97a4bc55baa3c296440690d113a7e45d683b7856fe5db2a1

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