Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e7eb74f4d37ad62…

MALICIOUS

PDF

71.0 KB Created: 2021-09-18 00:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4b56dbf95c7a1a8c6cd3c7849349d2cf SHA-1: 3d8195e8514c087e8722b255ad795129bacaedca SHA-256: 2e7eb74f4d37ad627eb03bd382c699a21f390e56e0a425dacfa8398ffd8428d3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also includes numerous external URIs, with one specifically noted as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of JavaScript and external links indicates a likely intent to download and execute further payloads or redirect users to phishing pages.

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
  • 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 https://pistant.ru/uplcv?utm_term=today+news+live+in+malayalam
    • http://imhome-listings.com/userfiles/files/putafugezoxifazuvijumer.pdf
    • https://safetypadlocks.eu/eurostyl/photos/file/85519690699.pdf
    • http://aotwresort.org/ckfinder/userfiles/files/95721917454.pdf
    • http://phongkhamthienhoa.vn/images/files/sedibujoxadawibilebix.pdf
    • http://3e-recycling.ru/app/webroot/filesfiles/vedesowovuwe.pdf
    • http://all-vehicle.net/js/upload/files/9036702988.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/9ffp0tt4ap3inglqu1am03o266/wimemebowitaru.pdf
    • https://aspirecambodia-edu.org/userfiles/file/9724048395.pdf
    • https://zhbiotech.com/CKEdit/upload/files/belebixosotaje.pdf
    • https://safrano.pl/userfiles/file/45652617421.pdf
    • http://asfalon.com/__files/file/bojizabapikusi.pdf
    • http://spielundlicht.de/content_provider/documents/files/78576020548.pdf
    • http://datcat.vn/2018/file/bubuguworupewixokaluxo.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/6aaef0de15f8fde5a8ec5b16fa1e2cb2/tidogobokotozufitujiramo.pdf
    • http://andreaslasnik.com/data/files/31791004205.pdf
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/85309804821.pdf
    • http://beta-rc.com/upload/files/tetofovamisekokujudetomo.pdf
    • http://graphicyazd.com/ckfinder/userfiles/files/bawubilewalebupurevaxak.pdf
    • http://stroyindustry.com/userfiles/file/lededejikilamepuzituwa.pdf
    • https://biharlokmanch.org/userfiles/file/sepobafokil.pdf
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/13116524520.pdf
    • https://kp-bs.ru/upload/files/dujow.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b267.bin
eeb16e3146322d2164b0cfd5a4e75dc31405abe8186dea33076b5fc778260243		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB267 10440 bytes
font_01_sfnt_off0000ca14.bin
d8ac8a951b2504942154f1507da680bd32824367b48b6345c2edbe273719abe9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA14 17176 bytes
font_02_sfnt_off0000f62e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF62E 16792 bytes

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