Malicious PDF — malware analysis report

Static analysis result for SHA-256 56ff57e6f57e0caf…

MALICIOUS

PDF

100.3 KB Created: 2021-10-07 21:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a0edfa6953781a2e091b208553698da7 SHA-1: a2d49d30ecf3b25dee4c745194bf0e7fcdd24ce8 SHA-256: 56ff57e6f57e0caffdb98e055ec8baf3d8de896439c8b50abc9385aca02f60cb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://nomylo.ru/uplcv?utm_term=resisting+linguistic+imperialism+in+english+teaching+pdf PDF link annotation
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/dexolil.pdfIn PDF document text
    • http://mayphatdienngocquang.com/media/ftp/file/sazoxekanojolafiketiwa.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/8865048315.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/8281417533.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de429596ee---98897926517.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/l0iordacsvs747mortvoge19ps/96666386737.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/zukit.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/29055553963.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/wofagugegiluxo.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/99368918611.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/xuxukaz.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/waxajutevivogino.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/2779747670.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/mekixewegawusoteg.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/tukofalu.pdfIn PDF document text
    • http://fruitvita.com/files/files/xafurilamogubuz.pdfIn PDF document text
    • http://carywinslowlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xirefefukimudif.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/10076605271.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/tusizuzela.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/vekixu.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/zerexu.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/23073192083.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/61584130737.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_off00011a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6D 21112 bytes
SHA-256: 205bb88e22463e4d481eb3636042d6408f4e4c224d697bebab24f60f3dd6bb05
font_01_sfnt_off000150ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150ED 11092 bytes
SHA-256: a9dea4aa213c67a2920da2563567e1f6ebb81a036ebd127a55bb93d70e4199ef
font_02_sfnt_off00016a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1