Malicious PDF — malware analysis report

Static analysis result for SHA-256 1af15dcf1417d096…

MALICIOUS

PDF

76.9 KB Created: 2021-09-13 16:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb794f53f1d043d3859665663ac18278 SHA-1: 3135be3b0d1fb1f4745db292cca5fbc7ec2d9594 SHA-256: 1af15dcf1417d09640bb750f21acd670c25b2e87e0fb5a7eb718bd41d65506bc
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external domains, many of which are flagged as link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it acts as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7612

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://garglob.ru/uplcv?utm_term=cycle+tracking+app+android
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/kaferejemolixi.pdf
    • http://liga-stf.ru/i/upload/files/dutadaj.pdf
    • https://zzwgjx.com/d/files/kamidulujukepenorol.pdf
    • http://dyccpharma.com/upload/files/negurudefad.pdf
    • https://trsoftyazilim.com/genelresimler/file/tabedowuke.pdf
    • http://berbun.com/user_img/file/14324639602.pdf
    • http://swatimishra.in/uploaded_files/userfiles/files/99637532835.pdf
    • http://textstricker.de/benutzerdateien/jugugorazimeraw.pdf
    • http://circolosilverblufitnessclub.eu/userfiles/files/zurulamu.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/003fca3a801a01ded047f6b3b136ae87/14644611609.pdf
    • https://safarekhoob.ir/basefile/safarekhoobir/files/27131153523.pdf
    • https://granitnet.hu/editor_up/jevezajixipiniw.pdf
    • http://scsytech.com/upload/files/kodotobulig.pdf
    • http://pgp-puh.hr/fck_media/file/9900650076.pdf
    • http://domgr11.ru/uploads/files/wawagemedo.pdf
    • https://thefertilizergranulators.com/d/files/71975145134.pdf
    • https://gtnet-engine.com/ckfinder/userfiles/files/jixot.pdf
    • https://orrizon.ru/images/file/saniz.pdf
    • https://mygenius.ru/admin/ckfinder/userfiles/files/53607212114.pdf
    • https://poulinstrapscan.com/userfiles/file/59875647746.pdf
    • http://www.pethouse.es/ckfinder/userfiles/files/51479884552.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613565a8a97a6---90756522857.pdf
    • https://brothers-music.com/ckfinder/userfiles/files/86083095953.pdf
    • https://botroul.be/uploads/49688899047.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f176.bin
7f1cd13fbf44d9bd994a5ce957270ae71dacfdeb8c4ae898e12d9e6d090b20b8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF176 17292 bytes
font_01_sfnt_off00011e18.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E18 16792 bytes