Malicious PDF — malware analysis report

Static analysis result for SHA-256 13af11e5f678ad8b…

MALICIOUS

PDF

83.6 KB Created: 2021-09-09 19:27:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 33a5f9db60669c4d736df0ebe4f5b14b SHA-1: 80997fe0f3c9e8a7164d89b6bf5bae32bf63ca0e SHA-256: 13af11e5f678ad8b17a3bc402856e99232e668b50b7bb97eebd03ac93aa13d4d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high probability of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nc-israel.ru/upload/files/fogokigirexorekexamafoge.pdf In PDF document text
    • http://vitacanes.com/uploads/files/72768183811.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/zogulur.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/rodutixaniwuxunejogo.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/66165739876.pdfIn PDF document text
    • http://edallyshop.com/upload/files/70164957532.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109060011525445.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/57332525096.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/sozukodovifetabomi.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/fokuf.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/taseno.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/xetejanadigodikufagoxul.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/55476203838.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/tofudoxa.pdfIn PDF document text
    • http://etkenkalip.com/files/3119227491.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/nunaxa.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/58765607257.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/torovo.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/59523177042.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/83959638905.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/9882b8985829084d599e0fdb4b85004b/fifomiz.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/gaxuxotatufuj.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/famanapeximozokoledizole.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/garemiravexa.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/79055951706.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=java+lang+securityexception+androidPDF 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_off0000dda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BA 18708 bytes
SHA-256: 468dc716f57d687e465f8eb58902d9b2859c5414ff9371e5b1aac8d5dac8a4f6
font_02_sfnt_off00012684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12684 11064 bytes
SHA-256: 4b21c63a6a4dc8b80c5b4fc81b376d879adaf31875a5a6513e6f4972ecc9a394