Malicious PDF — malware analysis report

Static analysis result for SHA-256 8393a53794601f5f…

MALICIOUS

PDF

81.7 KB Created: 2021-09-17 16:34:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1b3600b7d657290fa99b1bce3702a654 SHA-1: 755bb5ea7d889013dcb24ed6e55efe8f8f577453 SHA-256: 8393a53794601f5f605f1f39fddbc2c859a8664790afaf50fa8103d06a173f78
126 Risk Score

Malware Insights

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

The sample was detected by ML classifiers and ClamAV as a malicious PDF. It contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior. While no scripts were extracted, the presence of external links indicates an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://wajl.net/img/file/2021917132220.pdf In PDF document text
    • http://matsonconstruction.net/userfiles/file/vugabapab.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/vedobikilolujox.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/64693569895.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/46d1gmkhdu51lm0fi35a95ri5r/53992632282.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/6155440306.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/kokop.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16142cfb231b60---77837369428.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/mazitapunekazovotekuma.pdfIn PDF document text
    • https://stopserv.ru/files/file/17227548596.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/62935049882.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/kadevedasa.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/fumozagixasapanilasepig.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/tusefuzikujinuk.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/8927015937.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/figifolikonasilupelorad.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/dovezo.pdfIn PDF document text
    • https://viceda.com/userfiles/file/jemewibabidusorako.pdfIn PDF document text
    • http://demkapi.com/resimler/files/88757827902.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/rirujoxisej.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/jibanavosug.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/12680127118.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/69619114963.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=delete+twitter+account+from+androidPDF 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_off0000d927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD927 18348 bytes
SHA-256: 72e9be263424a7e8ceca6e34dc80b073aca152ce7f4eb5160e635f5dbad13957
font_01_sfnt_off00010873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10873 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001208a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208A 10656 bytes
SHA-256: da5da2141f45641fe8ca7cdb94d5ca000d0d8889b8f4cf2f1efb04c10a64fee5

Open this report in the interactive analyzer, or submit your own file for analysis.