Malicious PDF — malware analysis report

Static analysis result for SHA-256 78062d0c80ff7ee0…

MALICIOUS

PDF

75.4 KB Created: 2021-09-10 09:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2d8a0e686ddbfc3c7557f2a4857320d1 SHA-1: d1b4cd5229980bd50a81fdbe1aeef9abd80296b8 SHA-256: 78062d0c80ff7ee0c63bc3b10d7247dfca66e05535977d68bd045b935d99587c
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which are disguised as downloadable files. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to trick the user into downloading further malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pixomot.ru/uplcv?utm_term=dr+dre+compton+soundtrack+full+album+download PDF link annotation
    • http://studiozoppini.com/userfiles/files/15063147530.pdfIn PDF document text
    • https://swiz.eu/files/editor/86699078000.pdfIn PDF document text
    • https://polaria.cz/images/file/rivukekebabe.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/wepogoxopalogelega.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/levajoravin.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/roxidozanilepopowowiziri.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/99760622180.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/simudawadidovasabin.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/2685229137.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/20275509272.pdfIn PDF document text
    • http://hospitalityroyal.com/upload_files/file/37778638335.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/xafitufot.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/13411989784.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/35823990366.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/mibomidigax.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/vabupajir.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/laxupabasep.pdfIn PDF document text
    • https://mlspoland.co/files/file/bozavinagibifazuf.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/tegelodixeboba.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/vaginodifimelu.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/tuzixufigelafafopisu.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/18657629337.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/notabevizuresu.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/tokepipurar.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_off0000bfb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB6 17248 bytes
SHA-256: edd280103ae62568258abc13ccfef9b85071130b0cb718308833da1ba00644d3
font_01_sfnt_off0000ebfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFD 11108 bytes
SHA-256: af539d2899bb99acbc69b29eeaecb8affdffbea9d6a4db26c2ff6c47fe0f1a45
font_02_sfnt_off000105bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1