Malicious PDF — malware analysis report

Static analysis result for SHA-256 231bd7bea0c7b5ac…

MALICIOUS

PDF

74.9 KB Created: 2021-09-14 15:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3c061e839c6e5444643776fbc1bb570a SHA-1: 7696f6c6cd49d3f634f6e010ab5b133cf6347c94 SHA-256: 231bd7bea0c7b5acc6d3ce4cffbb9dba0a18141c1152fb1b1d0e1bbf8ad55744
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 that point to a link farm, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://lexprikson.com/admin/style/images/userfiles/file/61088006799.pdf In PDF document text
    • https://hchoanglong.vn/userfiles/file/fodesisebuvawinej.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210911111407_752741613.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/78217831831.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/3069482920.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/gojofad.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/91490639534.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/99811831497.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/44254786556.pdfIn PDF document text
    • https://kccegis.com/upfiles/content/file/20210910015211.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/23031533471.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/pifunowi.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/30687091270.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b1beea832---10371671037.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/koneberuretibozigila.pdfIn PDF document text
    • http://mutitar.com/user_img/files/ruropojof.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/12443697125.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210913194519.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/wediputomifo.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/b4u3l6q2usfoa2ri0leps6c8bo/8159144963.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/22574218402.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/sesevebe.pdfIn PDF document text
    • http://jawarakreasi.com/file/76315391007.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=convert+old+smartphone+to+android+tvPDF 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_off0000c2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB06 16308 bytes
SHA-256: 8d0d4f482bc28d2055d63a87a98350ffd86714463f98e074396068e579300a25
font_02_sfnt_off000104ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EC 10752 bytes
SHA-256: d92d8f2fd7ee1aa9279ba87248ef07ce170c579966e0a1a6d6d5d5f8846c68c1

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