Malicious PDF — malware analysis report

Static analysis result for SHA-256 f399b4502cecc3c5…

MALICIOUS

PDF

78.1 KB Created: 2021-06-09 09:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a29def25abb99d91bee07db95c15a734 SHA-1: a8c88991e2e08758c1b9f37a25fff82bed6132f2 SHA-256: f399b4502cecc3c559d243a65ea7c9bd8ff2e1920e24039060d03ea63107df6f
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded links, many pointing to disposable hosting or potentially malicious domains, suggesting a phishing or link-farming attack pattern. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ketchas.ru/pbw?utm_term=state+the+dependent+variable
    • https://cdn-cms.f-static.net/uploads/4422627/normal_6049a2e52a17b.pdf
    • https://mebitulipavore.weebly.com/uploads/1/3/4/3/134339985/zotix.pdf
    • https://cdn-cms.f-static.net/uploads/4481841/normal_5fd2c159391f3.pdf
    • https://static.s123-cdn-static.com/uploads/4449177/normal_5ff65f2e451f8.pdf
    • https://baxegirugono.weebly.com/uploads/1/3/5/3/135319521/timexovizet.pdf
    • https://zitenimed.weebly.com/uploads/1/3/1/3/131383388/952688.pdf
    • https://static.s123-cdn-static.com/uploads/4388598/normal_5fe07c7d7cc76.pdf
    • https://cdn-cms.f-static.net/uploads/4448536/normal_604efc6f8fda9.pdf
    • https://kupufulat.weebly.com/uploads/1/3/4/6/134643140/548a9e427f.pdf
    • https://static.s123-cdn-static.com/uploads/4414689/normal_5ffe010509ae2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://lekipirunezi.pbworks.com/w/file/fetch/144618876/39921838566.pdf
    • http://kinuwibe.pbworks.com/w/file/fetch/144444141/78609726526.pdf
    • http://lomubel.pbworks.com/w/file/fetch/144497187/how_to_get_free_robux_with_pastebin_2020.pdf
    • http://poforezufovu.pbworks.com/f/vugewerafe.pdf
    • https://uploads.strikinglycdn.com/files/8742a3d7-ef4d-4029-984f-bdde3ed15ce6/58571489082.pdf
    • http://rawumadakora.pbworks.com/w/file/fetch/144551100/istatistik_2_vize_sorular_test.pdf
    • http://wiliser.pbworks.com/w/file/fetch/144569259/latijusinozufo.pdf
    • http://gabumur.pbworks.com/f/sikevibodurozikopeloxok.pdf
    • https://uploads.strikinglycdn.com/files/fb841676-be1a-485a-98d1-06c826bce623/the_relaxation_and_stress_reduction_workbook_5th_edition.pdf
    • http://togiwuvoze.pbworks.com/w/file/fetch/144456588/tsp_thrift_savings_plan_withdrawal.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e83b.bin
bb2aaaf437eeb58c0c329b5a0d2b4d3e73dc5d69331ffe9bfc041610f5131842		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE83B 4848 bytes
font_01_sfnt_off0000f894.bin
dd7b9155fae3afb9735da2f08a79e392794a859d741eee00006a81ff7678fe73		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF894 10696 bytes
font_02_sfnt_off00011cf2.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF2 4324 bytes

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