Malicious PDF — malware analysis report

Static analysis result for SHA-256 f10f582808ef921b…

MALICIOUS

PDF

74.3 KB Created: 2021-09-25 01:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1c4729e25707888071f4c160f439c195 SHA-1: c0c188f402eee4728f7682af22e86e0fae84bdb3 SHA-256: f10f582808ef921b6a82cc8f0cac1f143f9e170081018ae65d0fbec803aa8936
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for delivering malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to redirect users to a large number of distinct, potentially disposable hosts, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://zzwgjx.com/d/files/95147781389.pdf In PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/wuvujogamufimitito.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/difugekojaxijomimi.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/wunek.pdfIn PDF document text
    • https://derfo.info/resimler/files/miduvemimugavova.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/11913708029.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/wosedive.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/95298011894.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/59581068277.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/xavediluxo.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145cb9944bb7---14002432826.pdfIn PDF document text
    • http://xn----7sbndn5at.xn--p1ai/uploads/files/86929403302.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/bixepadavorobanewugil.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/45159266555.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/zagelesegireloru.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/94931672152.pdfIn PDF document text
    • https://goldengatetaichiqigong.com/userfiles/file/93078811492.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/kijonete.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/xakinikum.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/dipisivuwagod.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090814583173499.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/sonuka.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/sinewolupaxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=bahubali+1+mx+playerPDF link annotation
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/2455895470.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_off0000b7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE2 19984 bytes
SHA-256: d96399071bbe7d1f82c742b8540b7cfaf001162bebd0100fe697467065102298
font_02_sfnt_off000103df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DF 10588 bytes
SHA-256: 5c7be9eb0e9f4eb89624aab6f981937582b675954ce47b89c822b2ed97fa8fd6

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