Malicious PDF — malware analysis report

Static analysis result for SHA-256 5487f6257d1a33b5…

MALICIOUS

PDF

68.4 KB Created: 2021-04-21 12:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7fed9982098bb32f48e192e21f3c8f7 SHA-1: 02c3dcd52fadeaf89cde7592c2a15e60fbab0c9f SHA-256: 5487f6257d1a33b5dc3c894313687adc985df5df84cdee97cba97fb65585f815
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to disposable domains, indicating a link farm designed to obscure the true destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

Heuristics 4

  • 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
  • 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://www.pharoxglobal.com/sites/default/files/webform/7322176875.pdf
    • https://www.a1touchsolution.nl/sites/default/files/jonalizavilivoduse.pdf
    • https://vectorcorp.net/sites/default/files/webform/resume/wogudodijanaferewinige.pdf
    • http://www.friendlycc.com/sites/default/files/webform/zuguxinukebezukul.pdf
    • https://www.uts.cw/sites/default/files/webform/bofuwidesuxugebogaxa.pdf
    • http://pilgrimland.com/sites/default/files/webform/resume-uploads/61975266633.pdf
    • http://www.pbttphtk.gov.my/sites/default/files/webform/88462653206.pdf
    • https://ambrose.edu/sites/default/files/webform/vopezupudatirarib.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/99368311749.pdf
    • https://natsihwa.org.au/sites/default/files/webform/degajakuko.pdf
    • http://pilgrimland.com/sites/default/files/webform/resume-uploads/40494538869.pdf
    • https://ambrose.edu/sites/default/files/webform/lajeriz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=1000+places+to+see+before+you+die+excel
    • https://ec.europa.eu/eip/agriculture/sites/default/files/webform/juvuwudonuvusenovirem.pdf
    • https://gradfutures.princeton.edu/system/files/webform/49692556615.pdf
    • https://campusrec.princeton.edu/system/files/webform/rilawadabovoxilezevateg.pdf
    • https://printandmail.princeton.edu/system/files/webform/54002061309.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc82.bin
02cf9568306150f87341de49fa8d853bfb7e0149a70d716bfa5a57810462a31b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC82 5336 bytes
font_01_sfnt_off0000eeb1.bin
c9dc0debc1d379edcc84e99fd1ca16be1e7c7928f7215e45cf144be762a30b30
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB1 10496 bytes