Malicious PDF — malware analysis report

Static analysis result for SHA-256 21f2692be0bcef62…

MALICIOUS

PDF

67.7 KB Created: 2021-09-26 16:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: acc6c8b19c68764d1ef6421c4db31f26 SHA-1: 396fd42ceefe512d57d56e016e9fc3da69fd8150 SHA-256: 21f2692be0bcef62cfddd4fe8591bd560945f92df0d8a481c088fc56bf50abde
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as a phishing lure due to its image-heavy nature and a single clickable action. The embedded URLs, such as https://laborke.ru/uplcv?utm_term=cricball+apk+download, redirect to external sites that likely host further malicious content or facilitate the download of a second-stage payload. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 67 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 https://laborke.ru/uplcv?utm_term=cricball+apk+download PDF link annotation
    • http://bmcnx.com/userfiles/file/lowuve.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/47877961459.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/xuneluge.pdfIn PDF document text
    • https://henuopack.com/d/files/15238350862.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/9946875396.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/waperokewige.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/68003091739.pdfIn PDF document text
    • https://paramourpourbebe.bettygagne.ca/userfiles/file/18310848615.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/38446986468.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/kuxarifemidupiva.pdfIn PDF document text
    • http://handgun.ee/media/file/zifojonolipupa.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/42675760485.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef0a1bcbdd---57724710285.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/jadagemijotujiga.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/nexijavobozibet.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/31191651642.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/juzukizitapaz.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/69000988768.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/52970713239.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/jevufowabafasoroxapunona.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/67868386624.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/povugisofagede.pdfIn PDF document text
    • 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_off0000ae81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC698 10456 bytes
SHA-256: d3c3415bfdf5310c92300e6ae6b26413fc144c63daef9aaa969f159af170e6bd
font_02_sfnt_off0000de37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE37 14200 bytes
SHA-256: d3d7800d7b6d5d2fcb5dfe3fd167cfe706a5fac785fab075310f03cc3681ec28

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