Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f792658cffcb445…

MALICIOUS

PDF

81.0 KB Created: 2021-09-10 14:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 134f3f8ce919ceb28abbfa5e9d1ae978 SHA-1: 739b48bd616a3da3d29481ca48ce2a63c043c76d SHA-256: 2f792658cffcb44567b3e6246497cef985c5d4c535ff5e61caabbe3889a24ffc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. The presence of numerous external URIs, many pointing to link farms, suggests an attempt to redirect users to malicious sites. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.autopsrus.com/ckfinder/userfiles/files/fajamovabefofogozuzup.pdf In PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/19169328396.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/genotibubamewir.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/70556491921.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/77752181944.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/lafunopidinewatu.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/78612504894.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/10301545942.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/sadabamoxarisowug.pdfIn PDF document text
    • http://irollee.com/userfiles/file/fumevafunaxumut.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/pabodagebesasapi.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210910130703_irgezo.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/zinanenofog.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/4778076124.pdfIn PDF document text
    • http://vizcsap.hu/files/file/86758497996.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/43539665740.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/1551197201.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304fdfdce9e---zumokulovevojaviwiziw.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/61070894660.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613427ef96b83---vepamimoj.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/54160050071.pdfIn PDF document text
    • http://unibox.lv/files/text/31008471442.pdfIn PDF document text
    • http://ned.ru/uploads/files/tuwoberozesewutexej.pdfIn PDF document text
    • http://195exim.com/datas/files/83922704038.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/sebopelejapisom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=ometv+online+no+appPDF 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_off0000d7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B5 10236 bytes
SHA-256: 8b9e33491fa14c2b7098d9713f2972e9d51357fc42fa2baca5f87b96114332cb
font_01_sfnt_off0000eea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA6 18268 bytes
SHA-256: 0b63595543d554020022760dce27f9262f451b7b52db1ad0c3cc0a7147e5605c
font_02_sfnt_off00011e5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1