Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec37afed4c5b8bd8…

MALICIOUS

PDF

81.0 KB Created: 2021-09-21 10:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0daf1e2067ce97aec76df1fd70019641 SHA-1: 6303eb870ed45f3a9ef2aa30ad448e347f130920 SHA-256: ec37afed4c5b8bd8e95af8d157c1bf576e328529fa0a41047b0a925bb3f02907
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://wastran.ru/uplcv?utm_term=frozen+2+online+full+movie+2019 PDF link annotation
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/9a8d8f7c4a7f10af4329609c18dfe368/virubakolino.pdfIn PDF document text
    • http://airzo.net/userData/board/file/94863084372.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/89875223484.pdfIn PDF document text
    • http://coconut.hu/userfiles/file/ramibawisunawevatowofigut.pdfIn PDF document text
    • http://fullgame.hu/uploads/files/27298253725.pdfIn PDF document text
    • http://synergyproperty.com/images/files/69758624554.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/zudibosesexodew.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/14886763105.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88081228511.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/73823565199.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff8beb58a1---pedadosidozirafajevufum.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/856160131613878b5d3d5c.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/padodevoko.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/topesu.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/2934069941.pdfIn PDF document text
    • http://thongthien.vn/upload/files/sotur.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210915_091755.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/21195433207.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/rudud.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/67311265240.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/kitojopurigufujibilexo.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/66378982504.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/86473529789.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/tabesafedebibaletenoli.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/nezimuwikikipav.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/bajapenajuz.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/nabadofubibe.pdfIn PDF document text
    • 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_off0000d91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12E 17264 bytes
SHA-256: 223e872151b7362904fbc5faef75028d738d396287bafe105b81f1e0f2461239
font_02_sfnt_off00011dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBD 10612 bytes
SHA-256: 35259787ccf4735de810cddc4efbe2ecddc0a13008488fd0dd21993d633f88b0