Malicious PDF — malware analysis report

Static analysis result for SHA-256 509bf560fbfa3257…

MALICIOUS

PDF

74.5 KB Created: 2021-01-16 11:32:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: dee2d375ce0aefbeacd32f3ddc16bbcb SHA-1: dcfc218a95e2bc404135a3f7cd86102bc5874a99 SHA-256: 509bf560fbfa3257540a14d657272ff1ab28b132ee8b8e03ec4d5ea12606ae1d
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains numerous embedded links pointing to disposable hosting and a known malicious redirector, suggesting an attempt to lead users to malicious sites. The document body, though heavily obfuscated, contains references to popular media, likely as a lure.

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.
  • 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.
  • 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/123?utm_term=ex+on+the+beach+season+2+cast+maddie In PDF document text
    • https://site-1177879.mozfiles.com/files/1177879/black_panther_cast_and_crew.pdfIn PDF document text
    • https://site-1228341.mozfiles.com/files/1228341/aiag_cqi_23_form.pdfIn PDF document text
    • https://site-1196822.mozfiles.com/files/1196822/78789564479.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490367/normal_5ffa3affa20d0.pdfIn PDF document text
    • https://site-1176577.mozfiles.com/files/1176577/time_flow_taps.pdfIn PDF document text
    • https://sulefufevonabu.weebly.com/uploads/1/3/4/3/134363738/6119167.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445555/normal_5fb9fdf10cfda.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/iV1jcpf/football_coach_shirt_ideas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426422/normal_5fece6f3b9f47.pdfIn PDF document text
    • https://site-1168059.mozfiles.com/files/1168059/kaiser_permanente_covid_testing_results.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369632/normal_5fc099f046159.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE877 5348 bytes
SHA-256: 9500557c579e0bcd71c1d1c11e3c535e2a7e4c1d01bd8cee644618e4b3f8b441
font_01_sfnt_off0000fa88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA88 10184 bytes
SHA-256: 0a866a32a363de444af5fdf2aa1111ec85161e10131aeb0ce152a9d9772b5a70

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