Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ff92d6b78589445…

MALICIOUS

PDF

74.1 KB Created: 2021-09-08 20:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e58f54e3a5726880ce7b6e15a095bb79 SHA-1: f97c0abad465904b7a4ff7164db73da426172402 SHA-256: 2ff92d6b78589445589b27bc0c09a86558c58dc5cffb2c3f67e3e99d37f8b9b8
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs pointing to various domains, with a heuristic identifying it as a link farm on disposable hosting. This suggests a phishing or redirection scheme to lure users to malicious sites. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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 http://gyermekhaz.hu/Content/site_images/files/48168087913.pdf In PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/31054428554.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/8470442689.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/kabiritemalefotutisulave.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/binejirekurajitu.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021090306095373499.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/95815167500.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/55377116983.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/10839486071.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/47357064711.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/sutifiworogorijoruluto.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/polunajoxuwexirisudizo.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/14719624036.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/78334146725.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/nozivapekofovadeximila.pdfIn PDF document text
    • http://kahsport.cz/userfiles/file/29620685387.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/dutafalosidasivosaz.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/zapaso.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/3580508988.pdfIn PDF document text
    • http://cabini.it/userfiles/files/7680241358.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210903_115010.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-9-2/20210902022204192107.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/84144141020.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/tizovizesujirigusavave.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/92804744898.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=pink+floyd+money+tab+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000bf1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD734 10736 bytes
SHA-256: 98bb1fdf06d6ea9eb5827795b40f528aa5b21b6008840e135f785c9e4be6b0d2
font_02_sfnt_off0000ef9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9B 16716 bytes
SHA-256: 6d73ddcb2eb657535ed2089b4859989471d2be8c94d465ab6c3a054016003341

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