Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b8e546129f6d300…

MALICIOUS

PDF

72.1 KB Created: 2021-09-23 12:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4625abbcf3903d3bda3c3eec6479612f SHA-1: 4a54af3e629c280014d7ce972f9228322c50c1bc SHA-256: 8b8e546129f6d30068cf35dca3dd9857106721b4620601517dafed30beabfcee
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ClamAV detection and the heuristic for a link farm on disposable hosting further support its malicious nature. The embedded JavaScript likely facilitates the redirection or exploits vulnerabilities to download further payloads.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4060

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://wastran.ru/uplcv?utm_term=imessage+on+android+2021 PDF link annotation
    • https://tvmreza.tv/ckfinder/userfiles/files/newik.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/2593466103.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/17722652873.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/54147309916.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/7056324247.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/xixow.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27525464371.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/8532809181.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/14230993525.pdfIn PDF document text
    • http://pskov.agisinfo.ru/uploads/content/files/36055405433.pdfIn PDF document text
    • http://swhos.com/upload/files/85186790384.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/86387688961.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/16427329570.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/dokegobetidumelumuwafor.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/gadugonelimofik.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/xojiwajeji.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/wojibenusitalarog.pdfIn PDF document text
    • http://runhouchem.com/upload/files/94312172462.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/kanutulivolava.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/parupagubepe.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d746728b8---getasuxupafejidefajuti.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/wutofavigusolan.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1612f28ea17239---59179440548.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/45263249592.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/zesurinebofotevonagodi.pdfIn PDF document text
    • 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_off0000d0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F6 16628 bytes
SHA-256: a65437a2cbce0d01e6cf4e70a96c24d9e0b02c6a181abeef8bd48672247a620f
font_01_sfnt_off0000fbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDE 10692 bytes
SHA-256: 7c088d0bfa92e40902d98d509e9543f77a564de4dc511f97325fceae4ac327da