Malicious PDF — malware analysis report

Static analysis result for SHA-256 dae18d364e6e542a…

MALICIOUS

PDF

75.5 KB Created: 2021-06-02 02:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c0778de54e8c24479b3a602f90a9bd8a SHA-1: b5e970469d8e4c30b14c762b152d91df8ac33780 SHA-256: dae18d364e6e542a4e97fed2287b6de17ad0b58d26b60ab207a23a88cc61a078
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains embedded URLs and heuristics indicate it is a link farm designed to redirect users to external sites. One prominent URL, 'https://zajinet.ru/123?utm_term=cabin+fever+2016+hd+movie', is associated with a lure related to a movie title. ClamAV detection as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' and ML classification strongly suggest malicious intent, likely for phishing or malware delivery.

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 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://zajinet.ru/123?utm_term=cabin+fever+2016+hd+movie PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376120/normal_601b7d4e5e94e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388824/normal_603356000dfcb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448341/normal_6022bac5d0cd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461791/normal_605ef2ff60523.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366993/normal_5ff3a9824481c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423772/normal_5ff2f32df36fc.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4494440/normal_60afe6b8695a7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e62f21f-fd4c-42d4-bc57-4ee1e86aeac9/nukoxeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f65758eb-bfaf-4927-941b-fe2ac546a147/pusorebifulowixax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/404fcd28-fc51-4a58-96f1-62f3d256008b/ge_dehumidifier_adel70lrl2_not_collecting_water.pdfIn PDF document text
    • http://mumubib.pbworks.com/w/file/fetch/144413319/52491265280.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90fcf0d9-ee64-462e-92ca-f7ca31a954df/bofedudevi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6e9bf9f-59b2-4d05-aef5-377a1e7a2977/9145585604.pdfIn PDF document text
    • http://sijomirurefi.pbworks.com/w/file/fetch/144460914/disable_low_battery_alert_on_android.pdfIn PDF document text
    • http://kunixove.pbworks.com/f/call_of_duty_black_ops_3_ps3_mod_menu.pdfIn PDF document text
    • http://sofutikajen.pbworks.com/f/executive_functioning_worksheets_for_middle_school.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/w/file/fetch/144411963/58717030802.pdfIn PDF document text
    • http://gazumadu.pbworks.com/f/wuribod.pdfIn PDF document text
    • http://bevojoluvu.pbworks.com/f/introduction_to_radiologic_technology_8th_edition.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE917 5520 bytes
SHA-256: ae6e45213b9aae74e1491df535e4fe0ac850676b59d541360a3c8a34f63f8bbb
font_01_sfnt_off0000fbbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBC 10896 bytes
SHA-256: 2d1ef89385073bde4704607990582c6282b4244caff30faa144147f092c9716f

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