Malicious PDF — malware analysis report

Static analysis result for SHA-256 146fb9280f80f8ac…

MALICIOUS

PDF

72.4 KB Created: 2021-02-28 06:59:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d62ffe5bef7ee0b4bfe569b7966f58e4 SHA-1: 1de019613fe944b68a1be89f59cbf2d2a8f26c10 SHA-256: 146fb9280f80f8acb034b80f11ab111b11b299fba9c3bc69214f6ba4b7b02e27
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yafferge.ru/strik?utm_term=how+to+do+cover+page+for+research+paper+mla+format In PDF document text
    • https://cdn.sqhk.co/vitimosugu/hwqolia/mufejajekojadajilig.pdfIn PDF document text
    • https://navijaxilof.weebly.com/uploads/1/3/2/6/132696044/guzuf-retida-kuxulibej-watirun.pdfIn PDF document text
    • https://lupawepenotude.weebly.com/uploads/1/3/1/6/131606523/vezabuvafera.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425723/normal_6008c733d832b.pdfIn PDF document text
    • https://nopeludaseji.weebly.com/uploads/1/3/3/9/133986928/1848112.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426415/normal_603acaf1862f9.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/jfGeX1q/texevukatosim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370076/normal_6000bedad31eb.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuvezosapa/9igVSCV/50134341599.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bakoloj/276999554.pdfIn PDF document text
    • http://mulozeraxepe.epizy.com/jobov.pdfIn PDF document text
    • http://tukudapig.epizy.com/doboxegezuxafasewibaz.pdfIn PDF document text
    • http://pugorenorow.epizy.com/game_blockman_go_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/14404168120.pdfIn PDF document text
    • http://zunebodiz.epizy.com/central_budget_2018-_19_in_kannada.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_off0000def6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF6 5680 bytes
SHA-256: d42f960a6b0369306e6b507ef8fe430c6afde57f735c9dcf049c10bbe0a50214
font_01_sfnt_off0000f23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23A 9864 bytes
SHA-256: 30e6b2f747d73dc37ede3628d9b4590d58a36b8707a036b5eccfa508b296913c

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