Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d4ff7b043847f93…

MALICIOUS

PDF

88.8 KB Created: 2021-10-29 05:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 006688988ab05a96caff307feaccaed8 SHA-1: 6ee5e3aab761ad3425e24e88b99341372c25a32d SHA-256: 2d4ff7b043847f93da9620f6ccf5e525ff9d2ac9a0f892a3e592c8f8202412eb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, indicating a phishing or credential harvesting attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are typical of malicious documents designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://gbfrjournal.org/pds/userfiles/files/tipifaxovit.pdf In PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/rosowonodew.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/17315185971.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/37225505174.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/rupixuvapituralugowimoze.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/juxozubesurexumefakowin.pdfIn PDF document text
    • http://ktcz.eu/files/files/zugunu.pdfIn PDF document text
    • http://detskie-platya.moscowfashion.net/content/xuploadimages/file/75891550104.pdfIn PDF document text
    • https://guruvinodji.com/Userfiles/file/vabubelolonulemadokogonun.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/m6k5dptm674ecar9l6854j7fss/8357016654.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/zejowutumegosigudif.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/lozazirawusoluvox.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/542c4e35c7f694dc85a8fa12c026ea0f/92057123045.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/fakexogufadok.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/11787254106.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/dodimalutubivuvam.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/wubofososubasomis.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/41131657706.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/76566037133.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/96460385571.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/nopurazarixik.pdfIn PDF document text
    • http://888chji.com/userfiles/files/21217887580.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/jezixovafuwewusaxoxemavob.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/44887323829.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/D9plVHj2VOU/uplcv?utm_term=tithe+rent+charge+indemnityPDF 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_off0000f659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF659 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E70 10560 bytes
SHA-256: 1ec722506e8b47deaaae89b55665cbd751d4e104ca719b026b5575517ba61bcb
font_02_sfnt_off00012623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12623 18136 bytes
SHA-256: fcd339a80be91073adc36c142e87a0ddefa57c522a62e608300631f39a9e8e9e