Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4514981ec8d3f23…

MALICIOUS

PDF

77.6 KB Created: 2021-09-09 15:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3713145a6d4a178999e9cf7a54647315 SHA-1: 81dd1298e704582812f5f643d3d52fde33f251b8 SHA-256: f4514981ec8d3f23d0368065d46bc145762c067d7a302adc6b3d43a7fd883df5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links pointing to various domains, many of which appear to be disposable or low-reputation. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://startmatbaa.com/userfiles/file/diwesurefogez.pdf In PDF document text
    • http://objets.immoweiss.lu/userfiles/files/fonibulonojexunurofiloref.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/xaxenetax.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/vibibinopituwilak.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/67480817858.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109010549358110.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/varizegosatipupipiwir.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/20574953328.pdfIn PDF document text
    • http://edituj.cz/res/file/68093854672.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/jemirejipu.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/25470895687.pdfIn PDF document text
    • https://gilbertems.com/videos/file/26315118483.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/99633068601.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/xomazixega.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/75893368879.pdfIn PDF document text
    • https://micsys.in/userfiles/file/ripofeliparixosizasipunu.pdfIn PDF document text
    • https://panoramabyty.cz/content/sipajigimugojot.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/14765316753.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/fizajivegotemes.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/dulibikite.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/fibepimureked.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/tepoladozadejiso.pdfIn PDF document text
    • http://novafish.it/userfiles/files/zodatomiki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=live+indian+tv+channels+apkPDF 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_off0000caf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE310 10508 bytes
SHA-256: c8e9889116d022ba00505aa55b6ee476253f1ed86d6c06e30ba52af9d8141dec
font_02_sfnt_off0000fae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE4 17828 bytes
SHA-256: 2e42323072d6fd0521f21f72475b839e304e44b0955d84abc6cbbfe72a27ecfd

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