Malicious PDF — malware analysis report

Static analysis result for SHA-256 56fde90118cc9fe9…

MALICIOUS

PDF

76.5 KB Created: 2021-10-03 02:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 00f978fd5003c0d816e8d0a4506bd453 SHA-1: 2596c3a95ee22fa88b95a0be174155fc1d4a612f SHA-256: 56fde90118cc9fe96b4b77fcca21cb57479883d371b2df7c39c5cb9e55ca7a18
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating it's designed to redirect users. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the numerous unknown URLs suggest a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tipsclubcr.com/campannas/file/lotomefenidosuboso.pdf In PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-2/20210902112724722663.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/xobexujivezigemotuzukab.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/razipan.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/lunenexenixozedivatuzifel.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/83879422806.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109161949405603.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/momamavesajojojuruvagute.pdfIn PDF document text
    • http://channelletterguide.com/ckfinder/userfiles/files/jivurazivovegodiva.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210929020657.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/xexojiser.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/pizomotalosuf.pdfIn PDF document text
    • http://eunlocker.com/Images/Editor/file/miwenuxivametebidi.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/xekuxokekuseriwakutupumi.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/pibapekusidov.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9065a3a61---15276399516.pdfIn PDF document text
    • https://mar3ol.com/Files/files/boxuxefuluxix.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/52691054064.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/kozoxapomovojisof.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/40646548388.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/71551511553.pdfIn PDF document text
    • http://adice-area.com/pictures/files/dakimevatapexof.pdfIn PDF document text
    • http://gfzgt.ch/upload/file/nawuparasazuzid.pdfIn PDF document text
    • https://eastshop.ir/data/file/makotadiv.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/21393646195.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=shes+the+man+free+streamPDF 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_off0000c584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC584 10296 bytes
SHA-256: e027193d36a659880816810078d47ee6eff34c4b3fc7049c0f99c87ae904e30f
font_01_sfnt_off0000dc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF498 18396 bytes
SHA-256: 355b829d00b5e11228948c530a31633f025a171cbaa97fbbddaf970a62c9d392

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