Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d6cb62672186855…

MALICIOUS

PDF

79.8 KB Created: 2021-10-09 01:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 30b06cc4d460a190b66c284548cb0f71 SHA-1: 5eac96c98c33355ba642451e2808a56565afcf71 SHA-256: 2d6cb626721868551bd679f937a0796c957132f79133b216e4aa496c26ede0bd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and the link farm heuristic strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://queure.ru/uplcv?utm_term=superficial+laceration+wound PDF link annotation
    • http://tofuyatogo.com/uploads/files/kinenonazudumizales.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/70593483710.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/zazamimolevedut.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/64164568332.pdfIn PDF document text
    • https://kudusde.org/resimler/files/26749253506.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/zuvimudoduwumef.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/tipinin.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/nuvasibekuguruguxed.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/korawinajalenuzuwebu.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/munixomeruvusafimanapi.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615640c07e67c---kuwosenedapofut.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/papaxujisadovem.pdfIn PDF document text
    • http://zhongyuemedia.com/filespath/files/20210921030014.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/89480423075.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138aaa98cf04---9947351441.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/diguvumovanesudopi.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/pisikakapagabiv.pdfIn PDF document text
    • http://sartor.ru/upload/files/bidubutivakaguremog.pdfIn PDF document text
    • http://cyuansheng.com/userfiles/file/zibupekusolofukivijudoj.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/zeluvar.pdfIn PDF document text
    • https://salwangurugram.com/files/96542383831.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/fazotexeganeramomo.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/65669227019.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/20994440030.pdfIn PDF document text
    • 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_off0000d207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD207 18204 bytes
SHA-256: fd1543e10032f7a71a5fd92923624c004f32bd584a58f140751945f9a6158f37
font_01_sfnt_off000100d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D9 10704 bytes
SHA-256: 68d197fd73db042390e369bc8c4bb46f7bb261a2a38d4bfa5d4954d375cf3a04
font_02_sfnt_off00011993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11993 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1