Malicious PDF — malware analysis report

Static analysis result for SHA-256 552b1057e040f658…

MALICIOUS

PDF

86.8 KB Created: 2021-09-15 18:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 899a3d47506191de00e1e4fcbf9ba548 SHA-1: f2da785531272b59638e5792c5df5128228e4854 SHA-256: 552b1057e040f658177bce9ea339ad44dcd72c025bef37688ef2b9c14fa1eeb0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one pointing to a link farm that hosts many other PDFs. The PDF's structure and embedded content suggest it's part of a larger campaign to redirect users to potentially malicious sites.

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://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/zinitijaxixawolube.pdf In PDF document text
    • http://trovas.com/userimages/44676469532.pdfIn PDF document text
    • http://airsoft1.ro/files/file/ponogibobomosifurawowa.pdfIn PDF document text
    • https://electroagro.es/pub/files/kujuwiwimuzinuguvutuju.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/laxijorilusuxiser.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/53856317825.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/mogokamatifobe.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d933c5fd27---11011787082.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/28125401421.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/getukebegib.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/12522401115.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/99543625957.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/62962376954.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332e446379b---sonaxedir.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/80674656952.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210901_112503.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/26595265083.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/23115907880.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/2347356703.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/zireserobofopuraforeju.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/16304574210.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/86158022598.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/75579952378.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/laduzugeguji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=your+name+engraved+herein+watch+onlinePDF 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_off0000eb73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB73 19032 bytes
SHA-256: e571a2aca104aeb316926fa28166d230c7b317528de696689bdcd47ef9926888
font_01_sfnt_off00011cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAC 10884 bytes
SHA-256: 87dbd3615d4f41aa1cde7df883acdadfad8074a92360620666381314d4917cbd
font_02_sfnt_off00013575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13575 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1