Malicious PDF — malware analysis report

Static analysis result for SHA-256 86743c4e4257ebe2…

MALICIOUS

PDF

88.6 KB Created: 2021-09-14 21:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e82fb912e7e4810c15995f7cc518ac2b SHA-1: 6fe71601014eb75b2d983ba31568317554e6e45f SHA-256: 86743c4e4257ebe2cbf6a5a3ab6b2621487253e3abeb5c1b37021569624a0188
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, embedding a large number of URLs pointing to potentially malicious content or phishing sites. The document body is heavily obfuscated and appears to be generated content rather than user-readable text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134856dcae75---tojivibar.pdf In PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/5518775643.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/benibu.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/71592524850.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/161305a6527b15---41790847235.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/64826591494.pdfIn PDF document text
    • https://masukpt2.com/contents/files/8448567381.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/vagal.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/95819439461347fe86dd5a.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/fexinewe.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/97502777244.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/kunadiwuxum.pdfIn PDF document text
    • http://acril.ru/ufiles/files/56469246188.pdfIn PDF document text
    • https://lecachet.fr/docs/files/zulesijuminoxovuginebud.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/49154224269.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/fasugi.pdfIn PDF document text
    • http://jawarakreasi.com/file/dobodarosuwutusibeze.pdfIn PDF document text
    • http://grandviewcommunity.com/userimages/wewisijaden.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/26166333439.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/9571685453.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/babilonerilowupisopipewo.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/likoduge.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/69755491939.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/diveboratebonekujo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=when+does+the+next+season+of+my+hero+academia+come+outPDF 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_off0000eac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC7 21292 bytes
SHA-256: a1f22c6bce95cad0bf83efda94d9b18cfff4cf74c4d21ff766516b8282e89a70
font_01_sfnt_off0001228b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228B 11004 bytes
SHA-256: e30464d0213f6cc0b882a4066f21b0d1c7ea2281271c11839ea22005d07aab88
font_02_sfnt_off00013c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1