Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b89f1798b848a11…

MALICIOUS

PDF

81.2 KB Created: 2021-09-11 01:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d24d1e9577c62cceae973e21c896d393 SHA-1: 1c8db55be9c2f93a47e555ec0a878c8b2f93b9ec SHA-256: 9b89f1798b848a111790c01f0192adc59e2b410b477ca857cbce23ede5d5a5da
134 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm designed to trick users into downloading further malware. The presence of a 'download button' heuristic further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://banquat.com/userfiles/files/28238621186.pdf In PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362b5e2cfca---sanujiwofa.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/foliki.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/jatefirodanurirobadab.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/11487568147.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/51489675472.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/6970360396.pdfIn PDF document text
    • https://sergiomauri.com/images/file/18719156730.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210910231246-topeluparokoni.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/sifopim.pdfIn PDF document text
    • https://aokman-drive.com/d/files/3264947067.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/vebawefipunijomasafarewof.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/dirawaxunukubekupifidud.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/gadoweneravarogagazetimun.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/zijalogakux.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/50765763633.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/41b35e966ac5327d934c85e595094543/kerupazenapuxadidof.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/77189853806.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/zetazidej.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/mubiw.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021911546183750.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=project+drift+mod+apk+downloadPDF 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_off0000d89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B4 10920 bytes
SHA-256: 69089f200781df3864d3570ac0a5a5943461360722e483ab311c3736060625af
font_02_sfnt_off000109fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FB 17544 bytes
SHA-256: ecec31c9a3797be95e4e877b833d5502b7cd0826d772453a2f79bc165fa947d0

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