Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b1c6f390487017…

MALICIOUS

PDF

81.8 KB Created: 2021-09-09 17:35:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 331517ebb21bd2d4b3093f6509ee8532 SHA-1: f4e11956417e83d0bfce12cc8593cafccd6f72d6 SHA-256: 81b1c6f390487017d1a83c9e6198eb30d2080c3fc7a581542fd6e487efebe72c
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to various domains. The PDF's structure and the presence of many distinct hosts suggest an attempt to obscure the ultimate destination, likely a phishing site or a malware download server.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3253

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://khanoomhoteli.com/basefile/khanoomhotelicom/files/72595486003.pdf In PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/lajutekizo.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/2497501608.pdfIn PDF document text
    • https://crmsaas.dswip.com/ci/userfiles/files/35272952478.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/mavonovexukawopafu.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/54890953556.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/55099099504.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/pasivigo.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/morigituromelifawa.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f788593046---bedezuvirimizezelaturo.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/kopobitefisa.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/ronovijarenudavuzulu.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/bokurimafetisofipe.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/45960763158.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133625424147---ravapiwiwaguwosego.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/52308235165.pdfIn PDF document text
    • https://bazk.info/public_htmluploads/file/40670200329.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109091510407094.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/belonajodopuvipixadowobag.pdfIn PDF document text
    • http://108shiva.com/userfiles/file/In PDF document text
    • https://andhimazhai.com/images/files/nutojubamiraru.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/52090365426.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/17707850498.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/natujapem.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/70340216887.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=minecraft+android+to+iosPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF126 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10938 19096 bytes
SHA-256: ec998eee1e465c922ccbc3d69f35072e6a078ff61128a7dabb650867701ad748