Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeab91dde31f17e7…

MALICIOUS

PDF

70.0 KB Created: 2021-09-26 11:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1b05d5d21540622571adb35cd598fc6f SHA-1: c5757201aa87abb2ed946fd03c26d80f4ba56512 SHA-256: aeab91dde31f17e772ac6f27c66b860ef14694b5c29d74a8e8236dc06a1bb0e4
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm with numerous external URIs, suggesting an attempt to direct users to potentially malicious websites. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and heuristic firings point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/3f8c950535e90e4918fb4b6c75bf3787/39321940340.pdf In PDF document text
    • http://chinhsuasolieu.com/media/files/63928934955.pdfIn PDF document text
    • http://01host.ru/userfiles/files/30850554592.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/juromozisibokaxut.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/vosavakisenowabovotete.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/savibejepexolibeb.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210926081458_ncji55.pdfIn PDF document text
    • https://laser123.com/geektic/files/nesapemi.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/rapanevoxemelole.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/zizepefagavewi.pdfIn PDF document text
    • http://flirdining.com/uploads/files/xopixobitudanawurejop.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/34989162263.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/66495764816.pdfIn PDF document text
    • https://ivanamihic.com/files/videwodoputigevebow.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/c776ac74ae0b3d5d22e5c22ac8f326c3/gelobalerinifewad.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/wimukozipuxesakulobu.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/2439551760.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/77357685320.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/lomisizezukewusudina.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/vulowapadizosuj.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/5526081649.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/10114156381.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/bafinuko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=gta+sa+cleo+download+pcPDF 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_off0000b249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB249 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5B 15684 bytes
SHA-256: 32d48e28dcdefa3e28ec7bdf0d07398dc17e2f164cb34a443ce86a50431198df
font_02_sfnt_off0000f25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25D 10440 bytes
SHA-256: 0b2eac7ec5bedc6deca28bb21b0211e60a0019c7809e0345eeebb02e57f1d173