Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9574739595d5a06…

MALICIOUS

PDF

97.4 KB Created: 2021-04-04 03:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: eb370c5b48ea1010c3008f152a957d66 SHA-1: ddfa1e20bf7dca9e9fabe54886aa73a892a13789 SHA-256: c9574739595d5a06bd9d97ea7aea98a751cee1fc8ffb9087386f5c1ad08470ff
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with a significant number pointing to disposable hosting and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://kuzutuzo.ru/award?keyword=captain+marvel+first+comic+pdf PDF link annotation
    • http://pafowitowa.medianewsonline.com/brills_express_today.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479240/normal_5fd8256f6e4c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384048/normal_601a1d70a2c70.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416128/normal_6007b458a35d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464077/normal_5fe03aec0589e.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxodokoju/BgjeifN/71331443697.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456699/normal_6056ddf04f886.pdfIn PDF document text
    • https://cdn.sqhk.co/lisesemafo/heghpwS/89855755332.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458388/normal_5fc5d1a496787.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462075/normal_605449df216d5.pdfIn PDF document text
    • http://nikibolerobika.getenjoyment.net/luwaxebe.pdfIn PDF document text
    • https://cdn.sqhk.co/miwiwefe/xjbgjP5/lelojowipamomuponixuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383334/normal_6068e324f33ba.pdfIn PDF document text
    • https://cdn.sqhk.co/tidilotofuka/S4icunn/curtain_call_size_guide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ddb1515c-011f-4d6c-9a6c-b305a2039a85.filesusr.com/ugd/477ac5_221cbc76829b4cbaaa84e51738867860.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6dadb88-7955-48c8-aef0-88fbc249e72d/faduwugaxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bc7d94c-711a-4730-a83b-2919d317b004/32928907654.pdfIn PDF document text
    • https://6b52f5a6-db44-4d3e-8337-ab33c729cb13.filesusr.com/ugd/f4de5e_8794f907d1494927b9d598ea6d6b1b0c.pdf?index=trueIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_dac4fb3cd0e54545a12812e267714e98.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f9aee7e-17e9-4f0f-ae6f-568986f102aa/used_scag_36_mowers_for_sale.pdfIn PDF document text
    • http://lugimeviguv.myartsonline.com/applied_science_textbook.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_off00013fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FC5 5264 bytes
SHA-256: a7044c887f90da5630539d5bc15b20f7d65e844e569e58aa2c8df29ee755a745
font_01_sfnt_off0001519c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1519C 11524 bytes
SHA-256: f9997e88a0a806e4d81379d4a8da0b9da36745b7b894dd054caecb59b5887689

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