Malicious PDF — malware analysis report

Static analysis result for SHA-256 b53b187d11f98f0b…

MALICIOUS

PDF

85.9 KB Created: 2021-09-19 15:41:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 77c669343bd548a5ba080056c7920c10 SHA-1: a332b9331ffc74cca3682de8296b9417e933b505 SHA-256: b53b187d11f98f0baaf0ea6081f5e2b842a57edf338b3503a598d033d43da41c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to disposable domains, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://weilandvloeren.nl/fckimages/nudivawituvaful.pdf In PDF document text
    • https://eventaipei.com/upload/files/36838872291.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/gofawagixifi.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/pemaxomanimopilisewunogik.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210911202314.pdfIn PDF document text
    • https://partetesal.ir/data/file/nabipubadurazar.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/zaridi.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/kixadabaradobulivefidebo.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/sajopamiwemotuxupakezado.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/98193631163.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db4b9889b1---bofetepobapidiruk.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/52118022685.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/lefuroxefojivixaneludok.pdfIn PDF document text
    • http://strandedtattoo.info/file/lopapivejefe.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/37682889668.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/37814735395.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/1407158315.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/45533457570.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/42276772368.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/66600497002.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021091104415355.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/79367777796.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/3048183340.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/65488661613.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/75514271331.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=app+for+opening+docx+files+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_off0000ec09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC09 17276 bytes
SHA-256: 95aa941eb5eca7fdedc5c5b458484c11ba0403a7688f9be5a1ca620f63f2b43c
font_01_sfnt_off000118d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130ED 10780 bytes
SHA-256: 25141967f0bbe13b39c37fee7844f8a858d136e5abe6bce28a9d718747972cea

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