Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b3c785f18ea576…

MALICIOUS

PDF

78.2 KB Created: 2021-09-12 19:31:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 09916b3d93b672adbe684333980e17eb SHA-1: 01b21273269c5207d5a796fe6677c2271a1a4d56 SHA-256: 73b3c785f18ea57657cc242f37db9685287205139654ee879144bbba98246045
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://le-lemniscus-incandescent.fr/ckeditor/upload/files/29193398553.pdf In PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/gekij.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/40891410423.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/leperozufosubu.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/33220585622.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/61549898084.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/73260911873.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/gunonaru.pdfIn PDF document text
    • https://tarsiman.ee/files/file/61388334819.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388df2a1698---55527776724.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/basobomewakux.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/45005333773.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/vesefulituxizarek.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/36662003990.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/85073143186.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/gejeg.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/zisixes.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/58546147731.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/zomolal.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/og00e05huuvddmn45hquocvdm1/zizemesidegegufelido.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/vikexosegizoruf.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/97503041992.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=roblox+mod+menu+apk+download+2021PDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000deff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFF 19276 bytes
SHA-256: 0267cee2a6bb317f2e8682e38c0b401b298561fc77baec41ac0ae79e631f70b6
font_02_sfnt_off000111bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BC 10952 bytes
SHA-256: 52cc539a8e0918701b63cbb23b03960f035376f6cacf5426c5ac78c0060d0a26

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