Malicious PDF — malware analysis report

Static analysis result for SHA-256 df045a9866f4aa5b…

MALICIOUS

PDF

72.4 KB Created: 2021-09-20 18:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a0c0a970b195a4d9dd47ea355f89cf40 SHA-1: 0fab33855d73a606a765346749b8642e93cae755 SHA-256: df045a9866f4aa5b558e3964380ea0cf5acbc930c93f15df6cea766273ad0bdc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, presenting numerous links to other PDF files, likely as a lure to download further malicious content. While no scripts were directly extracted, the presence of embedded URIs and the overall structure suggest an attempt to trick users into navigating to and downloading malicious payloads, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.kroonzuivel.nl/ckfinder/userfiles/files/79047535017.pdf In PDF document text
    • http://logenamerica.com/userfiles/file/99848033618.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/76258447819.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/24073525625.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/jezurobajajivofubiji.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/2320484472.pdfIn PDF document text
    • https://shreegroupco.com/userfiles/file/supimulirivebinu.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/30490510542.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/23030339351.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/bikezikiju.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/lalozamopa.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/27539143319.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/13797594015.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/lonopewuvirix.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/53477929356.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/19267542021.pdfIn PDF document text
    • https://davnosti.ru/upload/9123994001.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/23463479715.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/robekene.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/31124190568.pdfIn PDF document text
    • http://dogable.de/userfiles/file/16384034225.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/jozodutotebanuxagujone.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/51311958455.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/gogofakevas.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/73658118662.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=brothers+day+malayalam+movie+fullPDF 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_off0000b832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB832 16476 bytes
SHA-256: 3f0b06007188b89c2a266a2c7823b467e1bfe50b1596c25ac3d4e595ae097998
font_01_sfnt_off0000e2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F8 10848 bytes
SHA-256: 597e2a1b4ff9071784b6e52a7edad7b2abb4d94f6fe1401e68bad643686602aa
font_02_sfnt_off0000fc22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1