Malicious PDF — malware analysis report

Static analysis result for SHA-256 375ec54158ee54ab…

MALICIOUS

PDF

83.2 KB Created: 2021-09-14 14:32:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8e3ea7ecd4adb9b3fcb1cc3e4fd8a932 SHA-1: 03356af9314680c91a6e581ffc35b4bdbc2066ee SHA-256: 375ec54158ee54ab895e225bab94029e69df14664b017ea8706df16f7eda942c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a large number of external links, many pointing to disposable domains, suggests a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is likely a link farm designed to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cn-daomeng.com/upload/userfiles/files/509714966e3d31bde49356b3eedf9fde.pdf In PDF document text
    • http://delve-cr.com/uploads/12465349330.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/fobilanizivun.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/8324219082.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/fenidagujavofofowifesaso.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161365d6fc8ba4---guzaxalusaletegoj.pdfIn PDF document text
    • http://ahknchem.com/upload/files/28788178356.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/9618682642.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/21369747357.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/topeladidupekada.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/vogopujizebewarud.pdfIn PDF document text
    • https://makenie.com/upload/files/zelukufe.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/loxibajaguxumolapurobeve.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/53519286475.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613767d6c73c3---nexubofegokidibuwodowal.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/85253749539.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/mefabumumi.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/5457238683.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/1312613149.pdfIn PDF document text
    • http://446888.top/userfiles/file/jepagakutabogag.pdfIn PDF document text
    • http://tchid.net/userfiles/file/31220777121.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/90231950635.pdfIn PDF document text
    • https://hgb.se/filer/file/suwopikajemidajugodelanim.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/31863700549.pdfIn PDF document text
    • http://litroshaber.net/resimler/files/40562942368.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=spectrometric+identification+of+organic+compounds+by+silverstein+pdfPDF 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_off0000d8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BD 19536 bytes
SHA-256: ea508034048f32b9016efdd4c8f11ac64aa070f2b9a08e79e8a852c98a29b3eb
font_01_sfnt_off00010b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AA 11460 bytes
SHA-256: d7eca7963527d518dd9e68ea6c7c8c3907dc4cf358c4ee110d33b957f8cff0cb