Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5565c1f4197c8fe…

MALICIOUS

PDF

92.6 KB Created: 2021-09-13 09:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ef2882fdc02152678d0db91f6780978f SHA-1: 5acf77b72b48df95b382fa968c045b42cbdee485 SHA-256: f5565c1f4197c8fe09c52e023286ec79240d5e9edb99b40d7b7eb868cc6b3330
126 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, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to potentially malicious content. Although no scripts were explicitly extracted, the PDF structure and the nature of the embedded links suggest it is used for phishing or malware distribution, likely via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • 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://pm-ural.com/uploads/files/24150568841.pdf In PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/bezadew.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210908_065334.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/38833143144.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612eec71f3fcd---banodipod.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/kexofopezixufipuvoza.pdfIn PDF document text
    • http://chugguwang.com/files/fckeditor/file/39094007334.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/jevozapinigusefamez.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/82562468846.pdfIn PDF document text
    • https://kapefashion.com/files/files/46938580262.pdfIn PDF document text
    • http://17njl.com/userfiles/files/16604567382.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/3090048559.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/bibunisotinul.pdfIn PDF document text
    • http://kmsenior.org/file/files/disam.pdfIn PDF document text
    • https://sapporopools.com/contents/files/leduxaka.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/winotepunivow.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210906124940.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/27344212145.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109022027454134.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/6200274302.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1014d8daf---tajanef.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/67567893859.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=persona+4+kanji+tatsumiPDF 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_off0000f94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11166 10624 bytes
SHA-256: 7e1139f6c66df750ff5122186b6a483782e6fb02a5265383a685f9a581402a13
font_02_sfnt_off000129c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C0 22312 bytes
SHA-256: d551b71c97661769b649a3557bda2b916f01b4d9324829b82abead54962680ff

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