Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f9aa54e04d0636…

MALICIOUS

PDF

92.9 KB Created: 2021-09-13 14:26:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8ac0d39329cd322ed43a30612d7f60a8 SHA-1: 12e91346ef78bf50e686d29771871c1155a863b2 SHA-256: 88f9aa54e04d0636e291db7f151de6f8da996eca17228ebe013be76a67badf4c
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to external sites, as indicated by the numerous external URIs found, some of which are associated with link farms. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4130

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dascalita.ro/app/webroot/files/userfiles/files/koreroviketol.pdf In PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/niwejidedebuxa.pdfIn PDF document text
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/40801303664.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/22129385225.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/2021921443458629.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/59690503736.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/87321068345.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613012d18670e---fefeg.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/godememekelejisozev.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/25187804785.pdfIn PDF document text
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/21137825244.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/97359828833.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/xetedenajil.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/29113731.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/58766270876.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/damoxuwurilativemaletus.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/pijusumiluxezusajoze.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/xijodarojigunaripakuzal.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210910131534.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/gojelitizu.pdfIn PDF document text
    • http://top-caster.com/userfiles/file/zotofijumifenasabekev.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/27727143189.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=android+app+cache+directoryPDF link annotation
    • 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_off00011b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8D 10492 bytes
SHA-256: 39387967eb06639ea7fb4afff4da3eb4a432044099478f44a85543841200bd57
font_01_sfnt_off0001335b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1335B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B6D 17572 bytes
SHA-256: 1d64fc69e3829e1f4b9193bd9a8c9fad64ef6a3eba82d39c666ba292c91d17c2

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