Malicious PDF — malware analysis report

Static analysis result for SHA-256 da4120bd763dc654…

MALICIOUS

PDF

69.4 KB Created: 2021-02-25 09:50:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 1397bbef5c161243460f71e8d40f1528 SHA-1: e0a27c4f28140251aa18a95c3bf83abaeb67b394 SHA-256: da4120bd763dc65473e1d9402e9f43b51d4b826cb07975fa7648844d6d1b5551
252 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a large link farm. The ML classifier also strongly indicated maliciousness. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crophysi.ru/strik?utm_term=how+to+put+a+bowflex+together In PDF document text
    • http://ketousa.site/kipovokiku4hf.pdfIn PDF document text
    • http://copalofa.site/input_output_tables_worksheets_grade_7evsop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415292/normal_5fe7b1e2c94de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448540/normal_6036034283ba7.pdfIn PDF document text
    • http://copyright-notice-ig.com/potemikevlq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487423/normal_5fc94e58a0ea8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495855/normal_6023f19d7b775.pdfIn PDF document text
    • https://mikedexe.weebly.com/uploads/1/3/1/4/131452733/7626547cb1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387233/normal_60329554ba394.pdfIn PDF document text
    • http://afterdealer.pro/nojokevozisijebgfd99.pdfIn PDF document text
    • https://rimozaruminipa.weebly.com/uploads/1/3/5/3/135391391/a95837.pdfIn PDF document text
    • https://davabodijesofid.weebly.com/uploads/1/3/4/4/134474123/899d6518833de5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448548/normal_5ffc851115a71.pdfIn PDF document text
    • http://domavera.ru/2136487031nwsgu.pdfIn PDF document text
    • http://contentmedialiteracy.com/how_to_sync_jam_speaker_with_ipadgt855.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/ropidadegaxut/sample_11_assessment_test_verbal_reasoning_answers.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_off0000d161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD161 5248 bytes
SHA-256: 4cc62ebbedf5c65b10e4669fb993d0686e6e1d238d61127fb22b5a1843623a5f
font_01_sfnt_off0000e34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34A 10404 bytes
SHA-256: d9166645a31d2773ba9af7519ec58f255fc5864e49d928aae49bfb6e34186099

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