Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7744cf9927e8159…

MALICIOUS

PDF

69.2 KB Created: 2021-10-05 05:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c138d4f88d0a044fcdf62f1245556fbe SHA-1: efb87b6a7aef4165c709de71933d9bcb16ad9fe2 SHA-256: d7744cf9927e8159cde3696c6d5e3e6c9abc2072dba3aa17e526c51ccaf8e964
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=punctuation+and+spelling+pdf PDF link annotation
    • http://ibrahimalsada.com/pics/file/68813770132.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1614c62bf84c1d---1186718970.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161532ea8c6288---nimidawevurubodalo.pdfIn PDF document text
    • https://suny.cz/files/file/46924244718.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/94859222137.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/lafufovamawila.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/50079916436.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/52128563096.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109170754574803.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/94452194955.pdfIn PDF document text
    • https://semut73.com/contents/files/2524660325.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021091702053862.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/bogatajerurexa.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/sebexeluxurokijune.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/senoxupewetu.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/tenanudawixufuve.pdfIn PDF document text
    • http://hangquangauto.com/files/33113342003.pdfIn PDF document text
    • https://gulamanis.com/contents/files/48858742022.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/371361856137a26b894c1.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/ratalirufelunupojuxasan.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/mebadanigoraje.pdfIn PDF document text
    • 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_off0000aef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70A 10796 bytes
SHA-256: b88f7109d508eb0d006ff80a879054a7f4b2ae8d1c06b8b15015d76197723c09
font_02_sfnt_off0000dfd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD6 15572 bytes
SHA-256: ad8132c36cc65fe8f6b88e2eeb1dc1a721143b0c62c73744002c381b7dbecfc0

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