Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f5d2cbdccbaf54…

MALICIOUS

PDF

78.4 KB Created: 2021-09-21 05:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f7ba8a1e2db88897258d8b52c88f3d67 SHA-1: 50d8202ff4fbe05ffee4bd22dccb4f1900d4fa28 SHA-256: 87f5d2cbdccbaf540bd0147c627ffa149b91486ea8336b6ad45ecd23474f5fe4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used to redirect users to malicious websites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pistant.ru/uplcv?utm_term=mame+4+droid+apk PDF link annotation
    • http://ausafe.net/images/art/files/42387628820.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/32246425535.pdfIn PDF document text
    • https://sassanoproperties.com/FCKeditor/file/wojitusemawupedimuwepo.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/27385940497.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/feveguzufokidafoje.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/fomedopuvabizimuruzuvasad.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/dejunofutesuxudizu.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/15379715708.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/batemepukedomumef.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/73947416119.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/87570505755.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/40729037660.pdfIn PDF document text
    • http://mebco.ru/images/file/vikaleva.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/80389952942.pdfIn PDF document text
    • http://dgjst.com/upfile/file/35665195061.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/83581555898.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/46151327063.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/pupivulidod.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/nazunusivo.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/27278862244.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/29909467413.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/63798333961.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147dd7c50b11---dotesi.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/vesaxabiwumozape.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/81646851584.pdfIn PDF document text
    • 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_off0000cf74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF74 17484 bytes
SHA-256: 1ef51ac5def72cbe1a00d8dbdded4eb7892114d5fcef6d489698dfe98f5192e0
font_01_sfnt_off0000fc5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11473 10300 bytes
SHA-256: 7772b13e905a93567c25ddc07fb08d4a1ef997e9bf9c4a9640210e734fb91d97

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