Malicious PDF — malware analysis report

Static analysis result for SHA-256 dae6969f67d04acf…

MALICIOUS

PDF

83.2 KB Created: 2021-09-10 16:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fe6e515df6872664a8e7e108540b7522 SHA-1: 123bde653f0f5fc3f61a264d07232bb968bc6175 SHA-256: dae6969f67d04acf070c268637563c98e8a766302b41599b9cdaa0822d20e463
126 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious. It contains numerous embedded URLs, many pointing to suspicious domains, and one heuristic identified it as a link farm on disposable hosting. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links. The primary attack pattern involves directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://healthtecindia.com/userfiles/file/61323289718.pdf In PDF document text
    • http://abwclayton.com/uploads/files/leposafifaxukexesewe.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613134bf1c402---mejevagubixazaroregar.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/godofekinemi.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/65098770235.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/68112195251.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/161337a1f5671e---98019084091.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/92400974977.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210906203451.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/50231043984.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/75796700465.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/zipimuniwedekoxamek.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/judegatigelimanemob.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/zujadiba.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/81567358252.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/lilurew.pdfIn PDF document text
    • http://pk-rowery.pl/user_pict/file/jididagaj.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/suxajewin.pdfIn PDF document text
    • https://estoniapools.com/contents/files/rebejumunumiso.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/6137629b8d120.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/nifuxalusopodufofen.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/sorude.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/basutukapepipipopujofedax.pdfIn PDF document text
    • http://rnralpha.cz/res/file/69628293141.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/55664426952.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=download+pdf+buku+gratisPDF 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_off0000e04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85C 17720 bytes
SHA-256: 46f8088c439204d48a640fd2fb761e8c49e992cbc0164c7470680c8e848f4a1e
font_02_sfnt_off00012602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12602 10960 bytes
SHA-256: 17e8fee4eceab5a411e0f019a66900964657b9e91e99cea21213fbbe57ca56a0