Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b546add49686b1e…

MALICIOUS

PDF

70.7 KB Created: 2021-02-26 09:47:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1fb974374eac006aa4c3f2be2ee96b32 SHA-1: 3f4666603cc875d50e4c7e797a77f8f09abce270 SHA-256: 4b546add49686b1e8facbefa26f9e216281f0e4db29e8e82c0c412391d12d2ce
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, with a notable heuristic indicating it's a link farm on disposable hosting. The document body, though heavily obfuscated, suggests a lure related to a 'Stahls hotronix heat press manual', likely to trick users into visiting malicious links.

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://jacksth.ru/award?keyword=stahls+hotronix+heat+press+manual PDF link annotation
    • http://all-host.site/vue_js_component_template_filey8fgg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495973/normal_601af58ac4bf6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489052/normal_603705ceb2b65.pdfIn PDF document text
    • http://vumexovuvelafe.medianewsonline.com/thompson_center_hawken_discontinued.pdfIn PDF document text
    • http://about-central.com/32222306141uj3bi.pdfIn PDF document text
    • http://ruroraratotu.66ghz.com/dalufagonojuvabizogoxaf.pdfIn PDF document text
    • http://com-copyrighit.com/durarazabq9og.pdfIn PDF document text
    • http://prizinsta24.site/796976735720je5b.pdfIn PDF document text
    • http://tafagejiveduda.22web.org/dofilalesenigadatejudalo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418590/normal_5fcaaf0ad4a4e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuputes.atwebpages.com/vizafe.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/scintillating_adjective_form.pdfIn PDF document text
    • http://vamivesuger.epizy.com/jirolidelekipabutusepefin.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/sigalizogewivufut.pdfIn PDF document text
    • http://vezevuzu.epizy.com/rice_lake_load_cell_wiring_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/dna_structure_worksheet_high_school.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_off0000d848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD848 5232 bytes
SHA-256: 4eaa7171c26d3e37b22a5e2c1a847ddc9d5132137ea38050ce2d56dd670bff10
font_01_sfnt_off0000e9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EC 10560 bytes
SHA-256: b96525fa11fa4b42f6af37ac4de28b278bd83913d97b6f7fc361565934616209

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