Malicious PDF — malware analysis report

Static analysis result for SHA-256 a24b908ea84ff616…

MALICIOUS

PDF

77.8 KB Created: 2021-09-14 15:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ae2b03195fc477280dfcead1eaf6afd0 SHA-1: 175ab4feef12158141079e8ab2ff2af8ea4112c7 SHA-256: a24b908ea84ff61630efe62adb2b71a2452fecbc2c6ebef28aeaf5997e6db9f2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and multiple external URIs pointing to domains identified as disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document's structure and numerous links suggest a link farm designed to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://smidgel.ru/uplcv?utm_term=sports+heads+football+championship+2016 PDF link annotation
    • https://big-affaires.com/img/pics/files/mivamifaj.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/98682251846.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/32545415591.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/nugabobikajesidupoxutow.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/64379817645.pdfIn PDF document text
    • http://seamacros.com/upload/file/xujamizeborinenetefi.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/tuporodisogilurutum.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/9785052030.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/tawiruvidupate.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/vasenuvaji.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/629464215.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137ffa83fe0d---xabujiminuberoz.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/piwujolebazuje.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/43453960748.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/29972944947.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/winaterekibukugigo.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-13/20210913163702683253.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/nirelavavarenat.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/lelolidojotazu.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/xikixumeros.pdfIn PDF document text
    • https://luminex.pl/upload/file/puwisizanomanelu.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_off0000c634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC634 11560 bytes
SHA-256: e4009110cd93b7582394b7b69cc100993bb21338be2cb3245e6780ecb662c23d
font_01_sfnt_off0000e13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13A 18444 bytes
SHA-256: 7464b74a6b8f126dc5b656386daffdf17dfbab35c472cc4f51c012739b023b46
font_02_sfnt_off00011134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11134 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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