Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a937c242115ea03…

MALICIOUS

PDF

71.0 KB Created: 2021-09-16 10:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ba7fec7ccefbfc87d6f2e2a9ea6dad33 SHA-1: e2015537b47bf9b936e7e3552ec298dcf717a230 SHA-256: 7a937c242115ea03b4e1c1521396abeeb74f431867f4270d3cd16cd7832653dd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF contains numerous links to disposable domains, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://xn--80aa5alfu.kz/file/zixatogodivuvakugubij.pdf In PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/ef18480630bf73855d988898136c3af0/nusaxeraredubutuber.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/161305bdef02cf---39735890474.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/penuj.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/93890977881.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210910065355.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/55141681100.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/xabadimiwupuzu.pdfIn PDF document text
    • http://yuhongzg.com/d/files/88168948357.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/gepovolo.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/zozazexazuresemetanurifi.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/timoradupili.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/zurokepovexivinexo.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/tubuzolisugafavon.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/mafajojevigajivob.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-7/20210907181006627352.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/kisitigenev.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/29614293832.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/60973715590.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/131843009864.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/geselote.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/72b189fdce944d89f00c81e2e7017b58.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wesatatawatotuv.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/tikarev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=twd+last+episodePDF 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_off0000b684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB684 10228 bytes
SHA-256: 16e06b6ac2c97837be670f82378cf512bc8cec37359f2eaaa7244719857fdb5a
font_01_sfnt_off0000cda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA1 15684 bytes
SHA-256: 63cdab5d0430201b37edeb1ae54b4c31faaa5005db5aa766b853b35ebf4ed2dd
font_02_sfnt_off0000f60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1