Malicious PDF — malware analysis report

Static analysis result for SHA-256 f045e5a83a88fbad…

MALICIOUS

PDF

76.8 KB Created: 2021-09-21 23:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9d4021bae0d3e0c7a94cdf252e4a679f SHA-1: f765f3ad01522b93849c71c37ecf234e8d1f7baa SHA-256: f045e5a83a88fbad57d48a9a697afd9f43eddfa667f379be7bbd22fae96d9573
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pistant.ru/uplcv?utm_term=cirrh+medical+term PDF link annotation
    • https://cli-kh.com/uploads/files/202109040926075308.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/pivolezebegupefe.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/venavusokaj.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1614231f675e5f---xexubajeze.pdfIn PDF document text
    • http://techmechengineers.com/uploads/56768859653.pdfIn PDF document text
    • http://watch62.ru/files/files/varaf.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/jitetavezexipanuzezu.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb779933a3---63043149934.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/60631277615.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/merunuwa.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210913040255_s4llm3.pdfIn PDF document text
    • http://freeski.hu/freeski/file/89136836149.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/dekifagobijolesom.pdfIn PDF document text
    • http://indemo.pl/Image/files/ziwasiwoji.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/lawebak.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/gemukogagolole.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/fegunafiz.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161313616c13d9---komot.pdfIn PDF document text
    • http://hansungidschool.com/userfiles/file/8519267986.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/56745629225.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/gaxoxojogotimajani.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/jasinuroze.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/93986245511.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_off0000c8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10B 10272 bytes
SHA-256: d7b5d384dbbb9781c6b7bb9ec81d19e30378155a2223adcc7a8e6a82997a96a0
font_02_sfnt_off0000f824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF824 17684 bytes
SHA-256: 069af6c864bf4032aa811f4641bca24e1042a4e7b7f512f066a9f2a0e6691508

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