Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6ddc20ea571bf03…

MALICIOUS

PDF

100.8 KB Created: 2021-09-12 07:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 22e2b622027d045ed7a59e3b4be78a87 SHA-1: 8504e26e289fae23faff654dc5c795067f44277c SHA-256: c6ddc20ea571bf0353cb95071cd769adfc90b48b67cca92d9996dc23455d4765
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm or phishing lure. The PDF structure and the presence of external URIs strongly suggest it's used as a delivery mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://collectifff.be/imgdb/accueil/files/97247184785.pdf In PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/kujanojokutitewine.pdfIn PDF document text
    • http://pjteam.hu/uploads/fadobutakelak.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/rixidaki.pdfIn PDF document text
    • http://xfswchem.com/upload/files/fabejomokimen.pdfIn PDF document text
    • http://kdekdyjak.cz/data/50734485195.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/34959612560.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/wirojewodowugema.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/konojodilevuki.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/zutofebegaxijoxaxozekugo.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/murejolatib.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/37414768711.pdfIn PDF document text
    • http://itena.si/uporabnik/file/gosujikavululugiketelesub.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sopanawijajiborigitepo.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/morudozokunizaz.pdfIn PDF document text
    • https://shibbirs.com/media/files/davezevofusirefajifuva.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/wuwejarekivomojonaru.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/92887570244.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/14270796884.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/25375330002.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/640d14ace51897b171cdc6d89e4921df/fonafug.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/aor9uardff6bt9en4it38be3g7/76595625177.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/72218639953.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/tivus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=boruto+naruto+next+generations+onlinePDF 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_off0001271f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1271F 17688 bytes
SHA-256: 629187b3c7db1c8a5c909ac8f887e0020411ac144c0bf4885d8b4c9227a398c1
font_01_sfnt_off000154f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154F4 10536 bytes
SHA-256: 3be2f8cc024d1fda10615abd3ec24fe23d9fb4265915f885f63d6e3da8b295d1
font_02_sfnt_off00016d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1