Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f865641fa6edb49…

MALICIOUS

PDF

86.9 KB Created: 2021-09-13 14:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1911398812fbe870c29efaecbd0c572f SHA-1: 9aed02e517ded917b63b227936d99e20cafeffe0 SHA-256: 4f865641fa6edb496d9c9be8a7ba6911a22e4b5410d8b025e42644dcdba96a05
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and is identified as a link farm. While no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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://hide-bo.com/img/tmp/file/zaxudewisopupowak.pdf In PDF document text
    • http://red-persimmons.com/upfiles/editor/files/ludazisalakavonisijugu.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/diximiniwavotidepodiwapa.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/dopir.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/59742121063.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/89824605249.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/77709532924.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/54518644159.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/wigimorifa.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/97066789583.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/gapipuk.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/71217077049.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/14169440965.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/81734485472.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/92834856847.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/16945589820.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/18944150165.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/pujumobatet.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135c91d918ab---fumuw.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/98577511029.pdfIn PDF document text
    • https://panoramabyty.cz/content/sefemojev.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/65849662088.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/87189634409.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/71911182038.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=best+high+quality+games+for+androidPDF 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_off0000efa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA7 17172 bytes
SHA-256: 9e0b5e338fd8ac177e8ba24dd62e732814fb67581a74e7f2fbdac42abcad6a4b
font_01_sfnt_off00011c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001341e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1341E 11216 bytes
SHA-256: ae6e4e0cd28141208e79c7f84ed94f9771c93d3f5d5f3c04b6dc54f4bedf944d