Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6fd92f9be0f5750…

MALICIOUS

PDF

80.9 KB Created: 2021-09-09 21:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c79fbbd9c32143cbc10cd3477b9739ec SHA-1: 8085fdf69190a308ae6f86ea65b453e51ade75de SHA-256: d6fd92f9be0f5750a40a0da8a3f24bd65314b6d219cd285e3f85885f396aaa18
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a phishing or malware distribution intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://magogaralbamoble.com/galeria/files/16626537136.pdf In PDF document text
    • http://glassick.com/userfiles/file/manaxunekex.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-9/20210909060429556542.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/53460406151.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/49173813003.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/depujara.pdfIn PDF document text
    • http://recviem.ru/img/upload/34677064826.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/86031199822.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/xanubopekekevetikefefum.pdfIn PDF document text
    • http://air-con.ru/upload/files/tikemedejedim.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb297eee03---xogojofikiliputi.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210907031357.pdfIn PDF document text
    • https://avflash.nl/upload/files/warezerepojobuzuketod.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/zopuleluxinuxuj.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/sigiruvitetuzem.pdfIn PDF document text
    • http://seamacros.com/upload/file/rugudelusasajukuxase.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/161337e9b40fcd---59038186721.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/38939586661.pdfIn PDF document text
    • http://erictex.com/ufiles/files/tanimubopepaguzal.pdfIn PDF document text
    • https://wonkingchina.com/d/files/ligujavik.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/66457247036.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/82032526213.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210905135600.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/71407419214.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=t%C3%A9l%C3%A9charger+facebook+lite+pour+androidPDF 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_off0000d25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25B 11180 bytes
SHA-256: 511790148fef29c8ae1647551d56bf648a1fb8176504723e923d8dbd8b17c2c9
font_01_sfnt_off0000ebb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB7 19148 bytes
SHA-256: 90ad28f0c0fc2b98ad2e571988bec9f0949b6e9e127d2a2c6b21a99873a5f550
font_02_sfnt_off00011bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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