Malicious PDF — malware analysis report

Static analysis result for SHA-256 d59acabe7d927e9b…

MALICIOUS

PDF

80.3 KB Created: 2021-02-25 07:40:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: da7db89e01578a6950d19ba5067e4ef2 SHA-1: 7d1566f7487e754773af1e4c172fa7e41b8075bb SHA-256: d59acabe7d927e9be7f482921c63054fa6174d569a659171beba77405935d146
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/strik?utm_term=stay+with+me+piano+sheet+music+goblin PDF link annotation
    • https://zadukali.weebly.com/uploads/1/3/5/3/135340438/sugubotobiza-wapajosuvixefap.pdfIn PDF document text
    • http://zegosuvavanow.22web.org/xurezunafujaz.pdfIn PDF document text
    • http://vijuziruzunubiz.iblogger.org/python_cryptography_module_1._7.pdfIn PDF document text
    • https://cdn.sqhk.co/xetokive/Cjrjb6w/csr_racing_2_money_hack_android.pdfIn PDF document text
    • https://pevamuwewewi.weebly.com/uploads/1/3/4/6/134636281/rizuf_madufozek_ripurife_sutunugulet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gipebevu.atwebpages.com/how_to_get_the_average_atomic_mass_of_an_element.pdfIn PDF document text
    • http://robireroruvudi.epizy.com/english_learning_classes_for_adults.pdfIn PDF document text
    • http://velumosak.epizy.com/street_fighter_4_champion_edition_android_review.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/zezigotifuj.pdfIn PDF document text
    • http://juropap.rf.gd/kentucky_marriage_license_form.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/kitumokebuteretenubogat.pdfIn PDF document text
    • http://sugizujesel.epizy.com/kemopekimefusorenofez.pdfIn PDF document text
    • https://s3.amazonaws.com/fidobakipivogit/windows_10_1909_msdn.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00011d0f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11D0F 16448 bytes
SHA-256: 1a5091cc334eec18b2bc2d3ddc08b06c8ea77b1af0a00e04272faf3d3d717d73
font_00_sfnt_off0000d5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F0 3052 bytes
SHA-256: fefe3dbefb2b9b26dfcd889fbf45dbdf82bdf90f4b9c5b33f48ec771d3107666
font_01_sfnt_off0000e0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C7 5688 bytes
SHA-256: 7a9388b1a1fde700e481fa4416d3df52a959cb0066b1eacd8a2a3f5a49426d42
font_02_sfnt_off0000f41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41A 12672 bytes
SHA-256: 499e5bdd66f0d879acafeaf85737311e183b138cb1459b67927ce40a2fc99f33

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