Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2f465baa3d3a3cc…

MALICIOUS

PDF

75.2 KB Created: 2021-10-02 18:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: dd5436580c0888c2ef1903ba28c462f8 SHA-1: a0f82d42b38c577b668bb06972bb082575ae3682 SHA-256: b2f465baa3d3a3ccb290037044ec63c252bccbeef8f030e588bdc5b79d12bd95
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are likely part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution intent. While no scripts were explicitly extracted, the PDF structure and numerous external links indicate an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://nomylo.ru/uplcv?utm_term=cute+pdf+for+android PDF link annotation
    • http://doktor-okonski.pl/uploadimg/file/46375992388.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/57896922272.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/fabotomamovubibotajanasu.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/dazijaditimor.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/66903196494.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/nopifufigigidos.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/47984710826.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/pobumogasijotiweb.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109191803025252.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/sebesoboxovu.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/vodijojilalalazolopupexo.pdfIn PDF document text
    • https://filetorme.com/upload/files/70148693366.pdfIn PDF document text
    • http://cy2hand.com/userfiles/goduzuwevuxef.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/63b977d89179b03b0169beebd745a94e/31961467973.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1631457881.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/salixojugifunogati.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/nofususefaxaxebe.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/pimaka.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/xufasejebaxozekiminu.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/96543716027.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/49524733059.pdfIn PDF document text
    • http://baove24h.info/upload/files/23670310198.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_off0000b85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB85F 21532 bytes
SHA-256: 97ac30e6b2578e28b3dfc245d6dc30eab9deae066799098d4faefc71ae388f61
font_01_sfnt_off0000ef9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B6 10408 bytes
SHA-256: 9d90de4cc0740421d1d74c40d8ef1ace16539be9b6a1fd7cc3405b822483c867

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