Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0f21ec98de41486…

MALICIOUS

PDF

92.2 KB Created: 2021-09-21 04:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e3d4d63569db57357f5918221e7acfcf SHA-1: 9e9aae13f958e8d481b388475ed79b499a873690 SHA-256: f0f21ec98de41486353e97304ffa382b58b4168b4cc8d7b6265d5784a288c0d2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially malicious sites, possibly for phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://uhorder.com/upload/files/tujofurav.pdf In PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/nejifuxakawaxib.pdfIn PDF document text
    • http://landpas.pl/upload/file/55053738221.pdfIn PDF document text
    • http://olguanaokulu.com/upload/file/zikejudon.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/63542891679.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nazisijobusutesexuba.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/5324412733.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/20915201914.pdfIn PDF document text
    • http://lifeisartfoundation.org/sites/default/files/images/userfiles/file/27736011414.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/tijavokusorejukutow.pdfIn PDF document text
    • https://hiroyoung.com/data/files/61494609298.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/pebowemetufopinafoti.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/66500941293.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/vuxalosezogivokasijesadu.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/94321712334.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/wulexuzixe.pdfIn PDF document text
    • http://kotolantopeni.cz/file/48858494061.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/legusebesiwavak.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/29266932889.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/99913720361.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/soniwo.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/22891603311.pdfIn PDF document text
    • http://vaynhe.com/upload/files/43989909688.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/32314974270.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/pipiguwubefi.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412cab3375d---duliga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=stream4u+movies+onlinePDF 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_off000105f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F9 10588 bytes
SHA-256: 5db05145aae88806d04bee7e89a588d01c827c1d115e9d864ce306f9b96e650c
font_01_sfnt_off00011e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13646 17228 bytes
SHA-256: 4e6ecbe85584c859088a17af0dbe1657d4717df775a92ff022ea5f99052af11a