Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb1595c549f0b7d2…

MALICIOUS

PDF

76.6 KB Created: 2021-02-11 11:39:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 0321f7883c4d660eaec3b35922f3c11a SHA-1: 66f55890694b562d34fb4f53236f93d671fdbd3d SHA-256: cb1595c549f0b7d294b2c804b1d8a786e99780713fc49b70f013b82935ee39b5
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to manipulate search engine results. The heuristic 'PDF_SEO_LINK_FARM' and the presence of many unknown reputation URLs strongly suggest a malicious intent to redirect users to potentially harmful content. The ML classifier and ClamAV detection further corroborate the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/wb?keyword=always%20hungry%20meal%20plan%20pdf PDF link annotation
    • https://worejatejele.weebly.com/uploads/1/3/4/0/134095890/laduk_rebodilibe_mufogo_kulunupu.pdfIn PDF document text
    • https://cdn.sqhk.co/sileluzorupo/hhicGwn/screen_recorder_with_system_audio_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvepiwedo/t9hjLeN/play_free_game_online_subway_surfers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386851/normal_60190e1b0b86f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391623/normal_601850f9759d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495994/normal_5fd3ac4345e83.pdfIn PDF document text
    • https://gafalevomunu.weebly.com/uploads/1/3/4/2/134235362/9561d2d6752d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491723/normal_5fe1a87830950.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427506/normal_5fdb70339312e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426697/normal_5fcf5842046bb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://migusopugaj.epizy.com/isl_football_game_app.pdfIn PDF document text
    • https://s3.amazonaws.com/bisazabe/luxunef.pdfIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/arya_ek_deewana_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/kinetic_typography_ae_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/pole_emploi_actualisation_fin_de_formation.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/muwowuzuletavaganir.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D7 5284 bytes
SHA-256: fbc5d838a22bd6b230ab2b38440d885db31a4d018a1dae369d0178618f1ee84d
font_01_sfnt_off0000f2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A5 10648 bytes
SHA-256: 1a557d2913b70dea171ed4f1c58162dfe0d032a3d6a8d98c74c18359a595384e
font_02_sfnt_off000116fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FC 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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