Malicious PDF — malware analysis report

Static analysis result for SHA-256 56f4420775ad005d…

MALICIOUS

PDF

68.4 KB Created: 2021-09-28 11:22:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 017317c89d7bc1ebde1b82ef0c421465 SHA-1: ad8f7cb73aacf7af319cd79ea0d5fd9c68d5c5c9 SHA-256: 56f4420775ad005d19e0a06e0a89dd18637a038751eccbff69861e04ab8e1cca
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The 'PDF_IMAGE_LURE' heuristic indicates it's an image-only document designed to trick users into clicking an embedded action. Multiple unknown URLs were extracted, suggesting a potential download or redirection to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://srtprogetti.eu/userfiles/files/vabupopa.pdf In PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/linijugobu.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/12539205992.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/43753221124.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/8196047868.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/muxebofir.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210910_124725.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/fijisowe.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/4622032023.pdfIn PDF document text
    • https://geniodelweb.com/file/notir.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/bazapikazaloxuvov.pdfIn PDF document text
    • http://briztravel.com/upload/files/deteduwovokoje.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/23872469958.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/xuresivapozalobubafager.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/19329494812.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/figixefupamojovodefok.pdfIn PDF document text
    • http://sdsenlex.com/upload/files/96843847013.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/gijupinar.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/kemijevowavib.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/kikej.pdfIn PDF document text
    • http://generaldistco.com/images/file/44079810036.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/liwegigo.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/56877710174.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=among+us+safe+downloadPDF 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_off0000b099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB099 14004 bytes
SHA-256: 77858cc83039165cfa367783508479c14246cfcd8bb87cc0f920684cfe694622
font_01_sfnt_off0000d3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB8 10572 bytes
SHA-256: dc43e080d02ac176f6da2d11c09902b02e669c0accf1d75c881d5c67ec9313ed