Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4d5284afbce70f5…

MALICIOUS

PDF

77.8 KB Created: 2021-09-12 23:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d1dadfb39611a60b3b1a4ac58e628859 SHA-1: 332e540e3454f1585b13fb868ebdfb2c4a31d3b3 SHA-256: d4d5284afbce70f5b1d713b49cb134718022b30b4e006e599e554ccd16596430
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. The presence of numerous external URIs, many pointing to disposable domains and forming a link farm, strongly suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://abnigakgdsg.friendship-match.com/upload/files/lixijirotob.pdf In PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132101a05604---19025295573.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/36313157638.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210910165927.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/kidugitevaputesumegururim.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/92551403807.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/53077812232.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/gopofu.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/sogikofizatevokoriza.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/26802065280.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/49897667861.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/9040172386.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/wuxatosukuliselinulodax.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210903155826_1501887117.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/dulogedab.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109021732243062.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/64228421486.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/popemoduresosuwawope.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/2e49876064838467c5f8fe269ff424ef/xafuvirafe.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/kuzezogelekimisokel.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/45846008074.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/49473230918.pdfIn PDF document text
    • http://erex.hu/upload/file/36218149503.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=understanding+the+american+promise+volume+2+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_off0000c7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF2 11360 bytes
SHA-256: 03c04c23c58a2232b6984e71f1c031c1d3ce0c90130c5bc679979b0ec1f9f189
font_02_sfnt_off0000fa55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA55 18240 bytes
SHA-256: 001a330eab80ded4c934bd2d64458291848950e1e9ae1f7c4c7db98c68c7cd81

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