Malicious PDF — malware analysis report

Static analysis result for SHA-256 5154e3c94a7722f9…

MALICIOUS

PDF

74.1 KB Created: 2021-09-19 03:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 116c6e97b242112715b082b25c26a659 SHA-1: a0794c2ede7a38486c5c24dbe07079aaf2ff8980 SHA-256: 5154e3c94a7722f9a9020bda2cd234cc835ec6c83c1a0a54af09d5bc66114765
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://rkmaster.ru/uploads/files/8433860059.pdf In PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/mamibaru.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/nemuzutisezolejewavovanu.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/zozifawewuxipe.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/48002519267.pdfIn PDF document text
    • http://greenhousehotel.vn/uploads/image/files/jawulidelariwulirilese.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/17304237075.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/96601123566.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/kebexi.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/tevaxekamilebiki.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/70382215437.pdfIn PDF document text
    • http://ned.ru/uploads/files/gosisev.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/wabup.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/dejazelomexulotozipugoz.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/14251012726.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/fowitotidavorekiduzir.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3e7f31b5b---sudotaziru.pdfIn PDF document text
    • http://tulga.ru/editor/files/71856902434.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109070012598454.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/89913956620.pdfIn PDF document text
    • https://fototipia.hu/files/files/kavalukibat.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/50826205132.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/67243054004.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/42557688204.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=the+biggest+country+in+the+whole+worldPDF 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_off0000bd3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD554 10888 bytes
SHA-256: a2c7c5c0e077e5726aa4bb4177c1df6dad6fe57ae798b5bc623e8d60b013b6ba
font_02_sfnt_off0000ee51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE51 17316 bytes
SHA-256: 8bd217b78026eebcac53943a64e6c100e19aa36211dc172fc5343efb78d71c43