Malicious PDF — malware analysis report

Static analysis result for SHA-256 d94bbd834d3dfe56…

MALICIOUS

PDF

68.4 KB Created: 2021-10-02 13:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 33deedf2d0843148cea12da1c5973762 SHA-1: f39b03533f2919aa790ed96510990b5f9be6b654 SHA-256: d94bbd834d3dfe568a9e58d8058cdbbde66918fcb2f68a7c71ec9ae9633eaca4
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical for phishing campaigns, designed to trick users into clicking embedded links. The document body is heavily obfuscated, but the presence of numerous unknown URLs and a ClamAV detection for 'Pdf.Phishing.Trojan' strongly suggests malicious intent. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://dlzj.net/upload/files/20210930164907418558.pdf In PDF document text
    • http://kerekagy.hu/UserFiles/file/85704378752.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/gitisunibazerifowotimew.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613543cd043c7---4865272770.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/telavu.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/62179656519.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/xuperijirisuzidozik.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/mewogaxamezujesid.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/89756633184.pdfIn PDF document text
    • http://wmasgroup.com/userfiles/file/gidewozurunufotid.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/1564455545.pdfIn PDF document text
    • http://pelicanfinancialnetwork.com/ckfinder/userfiles/files/walozebobefetenebubezom.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/vazorotafudowe.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/61816966538.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/lowikadinaxudivele.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109160409474544.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/97340055175.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/83553755667.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/gatavefizepu.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/gujalirevejolupoxola.pdfIn PDF document text
    • http://wine-paraphernalia.com/files/winep/_repo/file/liginerazelopekogolememi.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/wakefolonakuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=early+signs+of+autism+in+boysPDF 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_off0000afdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFDB 14160 bytes
SHA-256: 36cc865fd37c951ae62bb3d6366ac98bbbffa513e18573363420d5d12ce59d58
font_01_sfnt_off0000d320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD320 10760 bytes
SHA-256: 750bab1764360cb5dcc4468d634f7fdf87b132a8fb326cf2dea16e894d61f59c
font_02_sfnt_off0000ebe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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