Malicious PDF — malware analysis report

Static analysis result for SHA-256 be2ac412a6cf07c6…

MALICIOUS

PDF

79.7 KB Created: 2021-09-14 14:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 549c1262120a589ef6ef6ab7e683d1b0 SHA-1: 7b53401ccdc249f375c98773270ed8c5f1ae5684 SHA-256: be2ac412a6cf07c69138947d2ea63cec7e2f148c34a17182d0bf9130321aa3f1
166 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it uses a link farm on disposable hosting and attempts to lure the user into installing a browser extension or update. While no scripts were directly extracted, the nature of the lure suggests potential for JavaScript execution or exploitation to achieve its malicious goals.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://actybrain-consult.com/Upload/files/61695122580.pdf In PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/loponi.pdfIn PDF document text
    • http://anninh247.info/upload/files/90797928313.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/39918205854.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/23731522172.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/29183589032.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/notiritilatevanuvi.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/21094758831.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/jojakuki.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/7974580958.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/migususi.pdfIn PDF document text
    • http://tdbm.vn/upload/files/58269200625.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/85903260778.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/38081272770.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161338e282dd2a---89046916657.pdfIn PDF document text
    • http://abwessex.com/uploads/files/tamomemomajaseleforizuki.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/lirukiwezebuxube.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/32803853414.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/zaketobu.pdfIn PDF document text
    • http://ud2-140.com/files/gizikilunizakimuvozu.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/80611553560.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/nojezulatumolajad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+delete+chrome+history+on+iphonePDF 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_off0000d235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD235 17964 bytes
SHA-256: 7e12e858d3b2e03d1139154148f2a6b53cd74bc7075fa04ff3e7fb3ab385e689
font_01_sfnt_off000100b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CB 10808 bytes
SHA-256: 16338dea7a4ad95fa2b40769244a3b9cedb920a36f9ac0d94d0c5f04df5b9c0e

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