Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e815d1dfb431927…

MALICIOUS

PDF

75.8 KB Created: 2020-12-08 01:32:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 377c5a2d1776eca5b957d91e5731a42c SHA-1: 98d6e9d422b04db862439dccad5c67159060e4d1 SHA-256: 8e815d1dfb431927d4c3f9bb0e6131763d58594f31fb5a22d313c74b5b3d4d9c
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/strik?utm_term=description+of+trees+in+a+forest'. This URL is the primary indicator of malicious intent, likely serving as a lure for phishing or to download further malicious content. The ML classifier and ClamAV also strongly indicate maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://cctraff.ru/strik?utm_term=description+of+trees+in+a+forest In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369916/normal_5f8ced8cf3309.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466140/normal_5fa92bfb08adf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc376e18139af0376556c03/t/5fc77e280623334b0c622954/1606909484056/59366771431.pdfIn PDF document text
    • https://s3.amazonaws.com/gazivemon/fawib.pdfIn PDF document text
    • https://s3.amazonaws.com/xatojem/hp_15_f272wm_bluetooth_driver.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1a5de403f5353fd9b0b7a/t/5fc878d992e74531f3ccdb87/1606973658767/online_virtual_world_games_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/fasiwojuzo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6db4454d69c596231cee3/t/5fcbd2c726a2be7f6deef154/1607193290211/9701329170.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0bcfb2e537a05ef083615/t/5fc153023f75b1664305cc45/1606505220753/reliable_plane_ticket_sites.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5cbbe104edf1d77a2c1c8/t/5fc7ac8d0623334b0c6851d4/1606921358205/niluz.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcfa033ca23154c95b3d2a/1606220292990/87723779444.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1129368612547ed5f20ea/t/5fc128f53f75b16643fde431/1606494454237/zaxes.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_off0000ee33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE33 4976 bytes
SHA-256: 297581d10cfb6ee671a98abd1efc0d9461a1b31319a7686f5f5f8c3769b06889
font_01_sfnt_off0000ff36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF36 10404 bytes
SHA-256: 8f497f8eda43a491a84655766f9e377778b1f872d621dbfa8c9ac5e380947964

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