Malicious PDF — malware analysis report

Static analysis result for SHA-256 57c819c51f39ded2…

MALICIOUS

PDF

82.7 KB Created: 2021-10-11 21:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 09addd6c35199cad59f62bbf307daf42 SHA-1: a18f6871a08412eeaca1f57a96b96176172d4335 SHA-256: 57c819c51f39ded2ce275599cd3c84d1ee636b1d766fe5586922032a3577a4c2
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The sample's structure and numerous external links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://badanie-wody.pl/galeria/file/pevebivasekoresakid.pdf In PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/ebb507d3a37f9cd8c93d52b9e2760fb5/62891425541.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/fojapoxujupewed.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/af66ee5268757bedc95f40146134a27b/28012473101.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/94810151330.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/wunadipebovep.pdfIn PDF document text
    • http://raczcsalad.hu/files/25169572843.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210922_6398CCA2C0E88DBD.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/linivonadujuvojeziwifojub.pdfIn PDF document text
    • http://tatooazh.ru/files/files/wojarukozobo.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/96476649313.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/75768587154.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20211001_DA2F43BDEAEFEAA8.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/todalaretesexifujonuxexu.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/ganewobirogifasigadebili.pdfIn PDF document text
    • http://zhuxintrading.com/uploads/ckfinder/files/20210912/16314462938593.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/56451651825.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/bolemedone.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/47987572548.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/57177562757.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/nararezavenakav.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/7279833734.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/fuzulirozinilelosodar.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/xoripikerosalezumuzidival.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/4dZi1sgP-vI/uplcv?utm_term=priest+in+the+church+todayPDF 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_off0000ddcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DD 17852 bytes
SHA-256: 58354e897344559d3e9dda94731587ca84f29e29861fbb7b4d3448f176b71267
font_02_sfnt_off000124cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CC 10636 bytes
SHA-256: 3dfeb8201ebebcf7022772f0f933b2a834260fc204086b1ffdf7bb27485a8bc5