Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb813608adc604c3…

MALICIOUS

PDF

68.8 KB Created: 2021-09-25 04:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e383139ee0db18eb0f7e88c0ca9bf96c SHA-1: b98567d2db244fdb9cf1fca45a4533278add34ac SHA-256: eb813608adc604c34d8dbaafb1d8be3d221bf801547881195ce205354b818308
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://philabc.ru/uplcv?utm_term=osi+data+link+layer PDF link annotation
    • http://tjtvina.com/Upload/files/pazixegelimolegaki.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/muduvugusut.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/sedotediwonoloxik.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/zamolitupobuvozebetojo.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/42944669983.pdfIn PDF document text
    • http://celesteandtorsten.wedding/images/file/55631391580.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/figuwezevosivuzuf.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/rawemelujan.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/41119417668.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/fodevud.pdfIn PDF document text
    • https://geniodelweb.com/file/67246043485.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/rixilirafexu.pdfIn PDF document text
    • http://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/bisiregapuzaxekobonu.pdfIn PDF document text
    • http://pvvc.cz/files/vofavawixojawusorewurita.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210925_288C54BC898A396E.pdfIn PDF document text
    • http://rsst77.ru/upload/files/vamoto.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/95953130547.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/sewoj.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/fekubefeluru.pdfIn PDF document text
    • http://pekbdt.com/filespath/files/20210919050648.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/13414371492.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/21069681738.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///bijesu.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/zodop.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_off0000ae45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE45 10352 bytes
SHA-256: 4c0c765224f8964e517ec85e033da1d339da188ff3d1598e3555187cc2a119f8
font_01_sfnt_off0000c5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D1 15724 bytes
SHA-256: 51b2343b1165f16b0650b910d5aad2f951d654e8400c5ffdaca8f27bb71ceca2
font_02_sfnt_off0000edfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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