Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc6b669c688e9ab3…

MALICIOUS

PDF

80.3 KB Created: 2021-09-17 22:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ab2f88e9a571c14c4f1d26062b5a3304 SHA-1: 90dd60e3611605777fbdf68de372adeb53bd2ddd SHA-256: cc6b669c688e9ab3c3c0012f4080caf5039d8ba4b5e22388657e565ffa2c81a6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs, many pointing to potentially disposable domains, suggesting a link farm or phishing operation. While no scripts were directly extracted, the PDF structure and URL distribution strongly suggest it's designed to redirect users to malicious sites, likely as part of a phishing campaign or to facilitate the download of additional malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://karlsbach.de/userfiles/files/72735166754.pdf In PDF document text
    • http://guojingmall.com/userfiles/file///vomuz.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/14804210001.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/4096781101.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/91848053312.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/begor.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/netumuzufotusuwumibep.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/2627664089.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/zemonatisazirilonaxufilik.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/61470151858.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210911171701091.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/momub.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/86462461508.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/63935201289.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/badejul.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/lanamon.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/kamajozamoluzodefe.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7a91b09dc---rugoxezumumujuwoki.pdfIn PDF document text
    • https://mattress-leader.com/media/71086808183.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/jilebum.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/mironukosenajojovinija.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/14958777210.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/loboz.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/baxokegutufugowivaj.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/vuleraxowanijegubiluta.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1630981260.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+take+screenshot+on+galaxy+note+20+ultraPDF 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_off0000cc20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE432 20308 bytes
SHA-256: 6029ccccc31eb203d134a1e9ee7135a2e61e8a60a010f7dfef0fca61ccd84239
font_02_sfnt_off000118c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C2 11144 bytes
SHA-256: 1c7c967baff4a57282c83b26bbe0d959d61e1ddbe82b7cb9c50e7f6e33be9f34