Malicious PDF — malware analysis report

Static analysis result for SHA-256 db271f12e9087177…

MALICIOUS

PDF

83.1 KB Created: 2021-09-23 21:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 96c0e2e9baab83fab557a8ae323c3a66 SHA-1: d20373cb62ceb92f792e1c239cd64cbee2fbc5dc SHA-256: db271f12e9087177b375ff7457638efa08c06f532c4fe66486e68c3080657113
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a phishing or spamming operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://prestinireedcorp.com/userfiles/files/kupidetawosijap.pdf In PDF document text
    • https://weldingportal.it/userfiles/file/dijorezozopenifegef.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/19361089597.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfc8d58162---47992126579.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021923_95236_619.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/xirelofite.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/giwumize.pdfIn PDF document text
    • http://gibisch.biz/files/files/rosatuzakaxivedijun.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/nejixalin.pdfIn PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/dewuxawodosufipib.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/dadisam.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/wunevo.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109171614156518.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/nilabovanagudogivolufolab.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/97506891605.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/pifoxoruburabavix.pdfIn PDF document text
    • http://kelvista.lt/images/files/rujoxexo.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///kanukejomu.pdfIn PDF document text
    • http://chineseclothingonline.net/File/47759243965.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/giboxejazivoninomos.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/20/51353400609.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73878771110.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/nigasasuralefim.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/lunugutofafafo.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/10847201233.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=air+force+mod+apkPDF 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_off0000e222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE222 17376 bytes
SHA-256: 82e9e3b47e1d88d2108794f5b23d5f74384b4e5ba96fa38c7c0324ed5b73903f
font_01_sfnt_off00010eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C9 10440 bytes
SHA-256: 5859243d29b570a60dc5c5a44ffbd109d307a086cd02e5de063e651356f68dab

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