Malicious PDF — malware analysis report

Static analysis result for SHA-256 896846996f1bc1ae…

MALICIOUS

PDF

80.6 KB Created: 2021-09-13 16:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 79415d9f5ee00fa99e0f71b3b75c0296 SHA-1: 8fad8f61b4136081f0136cc2fdf73b35f6f03980 SHA-256: 896846996f1bc1ae49b1eaa0ad32da462b4105f46d27e1cf1d28e84b2148ecdc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs, many of which point to suspicious domains and are likely used to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate attempt to obscure the final malicious destination through a network of disposable links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/70773411068.pdf In PDF document text
    • http://nedirajtebosnu.net/userfiles/file/20671964820.pdfIn PDF document text
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/zujis.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/vodoxonizikux.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/19600755857.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/80156834330.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/diluwevi.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/kugoxopexixinavutitokataz.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/65918212398.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/15682185105.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/25019748616.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b05a5d0fb5---58272332047.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/lanebososinunaguvuzipolaw.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210913031458.pdfIn PDF document text
    • http://finliz.lt/i/File/84191387408.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/lisolakorezeru.pdfIn PDF document text
    • https://1000families.eu/userfiles/file/jomisidoreloluledefelefuk.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/38878673807.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/27726340289.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/32326738137.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/vatazumisogolugemuva.pdfIn PDF document text
    • http://sunway.me/ROOT_PATHuploads/file/011811384225.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/lefadiposofafaxifo.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/fiwojizatupelo.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/wadosaxutaja.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/49734880771.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/selojefub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=modal+verbs+present+exercisesPDF 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_off0000d61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE36 10808 bytes
SHA-256: aeea06b03e04d6bb44065a6b999a0e7f43bfa42031299dbe2cc2ee157adb97d2
font_02_sfnt_off0001070a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070A 17652 bytes
SHA-256: 6489d9714c5a031831e9e621cbe3d1e895e89bc5418389a6b1757b24387121f7