Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b7cfb98472466d5…

MALICIOUS

PDF

68.3 KB Created: 2021-09-24 23:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 66bf881123f9e9b2420c44e9b5f40e50 SHA-1: 38cbd36c73c83f3d178fbd634b7ccf82930415ec SHA-256: 8b7cfb98472466d5f3052ca0251682abcdcc877d632653746db1ec9f35d930f3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://phonphangschool.com/upload/files/63290698660.pdf In PDF document text
    • http://kaie.org/userfiles/file/20210920053833.pdfIn PDF document text
    • http://hzosm.com/images/upload/File/bosatodiderabulabegego.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/42460031957.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/sirisubimefilimikan.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/rexabutiviremezovi.pdfIn PDF document text
    • http://mp-journal.com/media/file/6643052570.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/60149989795.pdfIn PDF document text
    • http://salespate.com/userfiles/file/vimevaligozifuf.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380be6cf3ed---88204874740.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/64788531182.pdfIn PDF document text
    • http://humanlitech.com/files/files/sapan.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/59051425378.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/19282001467.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/vixorotomukumosalavin.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/83833492233.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/63347109091.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/fofokaseliwivulozixafizug.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/zilezusolagevezufum.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/91687438719.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/dedib.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/10535256317.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/12194801122.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/waramisujozojofefir.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/rizenupezeki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=android+hacking+book+pdfPDF 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_off0000aefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEFC 10668 bytes
SHA-256: 3aa0e7ad1182a45a41ac6aaf9b32c994f170e0f0d0eaec402668c3495d9779f1
font_01_sfnt_off0000c6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000def6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF6 14776 bytes
SHA-256: e3a4d50ea4211fd5960dd611e0f83c07eaf005bbecc24823b056db7e13e0be15