Malicious PDF — malware analysis report

Static analysis result for SHA-256 b84d516c70cb737e…

MALICIOUS

PDF

86.2 KB Created: 2021-09-19 09:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a8507bc6b32aadfa59d98236ea025034 SHA-1: 6f7200cc263065094ff8b95820c8277970df8967 SHA-256: b84d516c70cb737edab6445a78c669742274b6863ea8c5354f9f6eb9abf117d0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution lure. No scripts were extracted, but the presence of external URIs and the link farm structure points to an attack pattern focused on redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://hflbdq.com/uploads/file/040745561336.pdf In PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/54060854032.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/lexowemeke.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9nj838lf5bu5lohcrmpiukpmf6/2049456545.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/vegedovu.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/rapobunomexaputimapos.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/tepaxofavuvojete.pdfIn PDF document text
    • http://smirna.pl/files/file/pojodijuwexifi.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/c07d39c37b3e2d02673e333d46816486/gejelifuwisumijuguw.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/93294038677.pdfIn PDF document text
    • http://web5gstore.com/Files/files/14033795935.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/pikivigogolujagad.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/jimepasuvekoxu.pdfIn PDF document text
    • http://wujipacking.tw/upload/files/labolomurefikolugeze.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/zuxebu.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/kagolimafizamovepow.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/xukuki.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/danebugomonerapituropef.pdfIn PDF document text
    • http://sergeybazarov.ru/file/jisodibulojafi.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/darebesuduru.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/rulojaduxuxitevuxun.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/67014609168.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/gamaninil.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/gumadunutixuveluxexumite.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=full+movie+fifty+shades+of+freedPDF 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_off0000e9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101ED 10772 bytes
SHA-256: f87f1b4fe7d54d4e41b8eb21e5377a83c0251d323571cb7fce9df1feb5f95418
font_02_sfnt_off00011abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABF 18652 bytes
SHA-256: 2a4e7b0ced88a18363e4bab9f736a9d770409a0f63ebbbd1b0aa7cbaac9f9115