Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac3812be3daa18bf…

MALICIOUS

PDF

77.3 KB Created: 2021-01-12 01:39:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c8f32d7007bc5ed8ff6a11cd331ad05f SHA-1: d0e6d249636981f82fba52c326f2b966fcd2a19f SHA-256: ac3812be3daa18bfd1c7038b4e3c433f9acb76008edfc69df2fc05abacf2a8cf
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a link to a known malicious redirector, traffking.ru, which is indicative of a phishing or malware distribution attempt. The heuristic 'SE_CLICKFIX' suggests the document is designed to trick the user into executing a command, likely to bypass security measures and download a payload. The ML classifier also strongly flagged this PDF as malicious.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://traffking.ru/123?utm_term=irql+not+less+or+equal+stop+code In PDF document text
    • https://cdn-cms.f-static.net/uploads/4394061/normal_5f90c2338a0c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421200/normal_5fd1a1bbae75c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465556/normal_5fdfd2d629d08.pdfIn PDF document text
    • https://cdn.sqhk.co/tupipitijil/jbjeEl3/xituraledodusijafilukosa.pdfIn PDF document text
    • https://cdn.sqhk.co/gikunixa/mCJhdic/xovasixosoxiguluz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459062/normal_5fa4376173962.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455183/normal_5ff7d1492f7b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368219/normal_5f88b0b6e4a1c.pdfIn PDF document text
    • https://cdn.sqhk.co/javeduner/hdjihel/special_forces_group_2_apk_data_mod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403959/normal_5fd25a9184b74.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
    • https://s3.amazonaws.com/luxaduzimase/mla_8_in_text_citation_report.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/61729815861.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/78613947995.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/14164749732.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/printable_monthly_2019_2020_calendar_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/ics_200_instructor_manual.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_off0000e3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CE 4964 bytes
SHA-256: f4ef88bcd61491d0307e9c36cfac9ccad96d1388679bb2a258c2bbb977e89aae
font_01_sfnt_off0000f4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AB 10860 bytes
SHA-256: 3c08f3648deaff7246b48752cfa8eee0c09ae1819b702ded061be08456de5cee
font_02_sfnt_off000119c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C4 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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