Malicious PDF — malware analysis report

Static analysis result for SHA-256 99771a70cbdc5ee0…

MALICIOUS

PDF

83.3 KB Created: 2021-09-23 18:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 083e26829393c71bd54cff408e306651 SHA-1: 7b931bcdb12343d0d75f0a796cc2aae69d8287db SHA-256: 99771a70cbdc5ee0bcb3586241fbf0b11c0153b152dbdb6f8dcad719f288a271
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to external domains, many of which are unknown and hosted on potentially disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it may leverage embedded JavaScript or exploit vulnerabilities to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • 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://happyhanool.com/ckupload/files/fawip.pdf In PDF document text
    • http://lotusburbank.com/uploads/files/66682270586.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/xaxijidugegojujemiguxi.pdfIn PDF document text
    • http://rc-modeller.se/images/file///fegekibixip.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/455783f1193d7d6665409367ad65b36a/42140912348.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/jiturovumezutotogofi.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/85398012136.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/91639897498.pdfIn PDF document text
    • http://duef.ru/public/file/41467947163.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/48986420752.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/9115285501.pdfIn PDF document text
    • http://vce34.ru/attachments/file/27952380914.pdfIn PDF document text
    • http://hrudolf.com/userfiles/bofaveleraruz.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/47171144697.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/xebazugovivadudubiwol.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/25641787855.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/tagugovisaxoroxupivimago.pdfIn PDF document text
    • http://1carl.com/userfiles/file/12720055694.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410e5c7a74e---nunanuvejewir.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/nulefevarelovosifa.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/21145241999.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/natofowakumufilasirufumam.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/zuwij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+do+i+clear+the+cache+on+androidPDF 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_off0000e31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31A 17780 bytes
SHA-256: bb7159b4a3b0a3fedf5d8b51edf8c2041e50f974b01e98f5fcdab79b5e2c2a6c
font_01_sfnt_off00011085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11085 10376 bytes
SHA-256: d470d96161ecebe14ac2bca7d5f51bfcc1a7c867272247d95e692c92bcc93eac
font_02_sfnt_off000127e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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