Malicious PDF — malware analysis report

Static analysis result for SHA-256 d03dcec3e9922618…

MALICIOUS

PDF

83.3 KB Created: 2021-09-19 14:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ff837102ee0ff72453cda0216b5f0146 SHA-1: 9b0f9abdadb0bb712d76cdf60795b57b29623136 SHA-256: d03dcec3e99226187b2fe2b0e5095647bfae038ebdd777ee7717f84bf57ae66e
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting an attempt to redirect users to malicious sites. The file's structure and the presence of many external links strongly suggest it's designed to lure users into clicking through to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ketchas.ru/uplcv?utm_term=vidm+vidmate+apk+download
    • https://triangle-electronics.com/assets/userfiles/file/15545606871.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/f31f7924c6f65d6ee2bb704ee48f879e/luzijosodeb.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613f32491a770---29751090232.pdf
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/wijujo.pdf
    • http://burelomdo.com/ckfinder/userfiles/files/1357098769.pdf
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13081110432.pdf
    • http://flynewsletter.com/uploads/file/wifikabisonu.pdf
    • http://2446665a.ru/ckfinder/userfiles/files/32847519920.pdf
    • http://patrick-vallot.com/upload/files/46033023916.pdf
    • http://www.ags-sib.ru/ckfinder/userfiles/files/jugelidasapikekawutetit.pdf
    • http://newmob.it/userfiles/files/63547368036.pdf
    • http://asirakademi.com/resimler/files/sedojeponofatajene.pdf
    • https://stw-nowogard.pl/download/file/4213098185.pdf
    • http://yds-wcv.jp/free_images/files/rutiju.pdf
    • https://printjet.pl/pliki_user/File/dodirejabofu.pdf
    • http://crm333.com/documentos/file/ropipadedezozar.pdf
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/74468749554.pdf
    • https://yunglin.com/uploadpic/files/fomekimudezirejo.pdf
    • http://investbuild.ru/var/upload/file/93970557226.pdf
    • http://bouwbedrijfbouwheer.nl/userfiles/file/tofuxasozixarabowe.pdf
    • http://www.smpnuenen.nl/images/files/zigesozawuguxomikelaw.pdf
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/zutoriwal.pdf
    • http://szentistvanpatika.hu/upload/file/28676881195.pdf
    • http://gatewayhotelbangkok.com/upfile_hotel/files/99453163191.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8b6.bin
5b0ba2eae7099e9c36e477ed1cbb4fbf6f84c8e58d0e327968c1664ee9c1325f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B6 21076 bytes
font_01_sfnt_off00010f98.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F98 16792 bytes
font_02_sfnt_off000127af.bin
4f300f62cbb1cd5f94395252004c69446b9aa3856ec72d5bde868083f2fb27f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127AF 10500 bytes

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