Malicious PDF — malware analysis report

Static analysis result for SHA-256 9462de4862dc4959…

MALICIOUS

PDF

83.7 KB Created: 2021-09-19 21:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 00d20b8daed7591d795ec0f2a66c2d6d SHA-1: 8da58d3642596241687933e550e107ad15ff7900 SHA-256: 9462de4862dc4959cd1eff68d0b37f9e8361ad7940f71273997df3b76a13a227
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded links, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://isagrinio.gr/userfiles/44501322700.pdf In PDF document text
    • http://dieterheich.de/images/uploads/file/79836075768.pdfIn PDF document text
    • https://wineart.online/userfiles/file/73993763307.pdfIn PDF document text
    • http://xn--80aaa6aachkjln0qra.xn--p1ai/ckfinder/userfiles/files/wibaputubexuxivaje.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///79224320157.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210901_119D5AD87F834018.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/77038385979.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/54461774171.pdfIn PDF document text
    • https://nusantarabet4d2.com/contents/files/54836612413.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/46333081693.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/tuvolinisopot.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/disizefizebuxejibazewase.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/gaxanetevobomomeripezego.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/31108330319.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/27831325177.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/78309884093.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/35377085876.pdfIn PDF document text
    • http://rts-3.ru/upload/files/28916761705.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210914_104748.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/posaserog.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/40e054ff89bc6b2b4d413353267adc63/vunijerobifefadul.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/vezogajomukigesozotedila.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2083d18cd---fewaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=rules+of+survival+pc+hackPDF 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_off0000dd5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56F 19708 bytes
SHA-256: 42566f0870a8fec42ce9f7fd4011d903cc9e0be60175f5ccc5a4a9647ab20230
font_02_sfnt_off000128ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FF 10676 bytes
SHA-256: 38682dd4743eed71deb008b0daf83052924868e44acbbf9b6ee958a769f84313

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