Malicious PDF — malware analysis report

Static analysis result for SHA-256 e629507b4da16aaa…

MALICIOUS

PDF

83.9 KB Created: 2021-09-19 13:33:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ab1a3f7fb36cd1352d0cae67b64fcc24 SHA-1: 73d7bf503a40e3516ae8584a246f1abcdd174c1b SHA-256: e629507b4da16aaaea77ce2d32c662d100c49134a79ed06a3f9487086054d016
66 Risk Score

Malware Insights

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

The PDF file was identified as malicious by an ML classifier with high confidence. It contains a large number of embedded URLs, many of which point to potentially disposable hosting, and is flagged as a link farm. The primary purpose appears to be redirecting users to external sites, which could be used for phishing, malware distribution, or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 4

  • 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 http://ecole-belair.com/ecole/file/96686770879.pdf In PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/12496170144.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109080705305416.pdfIn PDF document text
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/sujejonumilugewojakotu.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/rinixodutowakupufizavo.pdfIn PDF document text
    • http://zuszdounky.cz/files/tovutelesejinikib.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/jezalafim.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/49081810694.pdfIn PDF document text
    • http://izmirtavla.com/upload/file/69597202027.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/vijipofexotidofuzirob.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/53609183300.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d943f36ae---56230471408.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/26074110404.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140f9b2d21b6---romerivobejapeludoxetix.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/guvivifokomemexevavo.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/vutotakunuvufo.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/14760913591.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/nenoneberekedude.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89108882891.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/kiwasixab.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/61341218992.pdfIn PDF document text
    • https://anjingliar2.com/contents/files/kenalugexefej.pdfIn PDF document text
    • http://022-web.cn/uploadfile/file/20210912220619627.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=best+free+soccer+streaming+sitesPDF link annotation
    • 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_off0000e302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE302 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB19 10684 bytes
SHA-256: 4a8b6fc28247f8a4645cde5953cf56ee7e0b0e4c26bb7f00c2b385c0f2492f6d
font_02_sfnt_off000113a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A6 17944 bytes
SHA-256: cf70c584256b12a4d99eae33ff64fa7139afec19e93df0aa3c0c8fb027352c55

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