Malicious PDF — malware analysis report

Static analysis result for SHA-256 8adecd608e40d878…

MALICIOUS

PDF

75.8 KB Created: 2021-06-06 03:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 6d4f883f18ff3a6204b6cee6ffbcc8e2 SHA-1: c7f10e4e4d78bb0cfd9fd1e40bab13ba83d027fc SHA-256: 8adecd608e40d878d68eb902c8ed704bea3e91813a3ce924c901c44acf8861f1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file is detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs, many hosted on disposable domains, and uses a "Nest thermostat wiring guide" lure. The heuristic "PDF_SEO_DISPOSABLE_LINK_FARM" indicates a pattern of using such documents to host many links, suggesting a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/123?utm_term=nest+thermostat+wiring+guide PDF link annotation
    • https://pokaruda.weebly.com/uploads/1/3/7/5/137509536/1607812.pdfIn PDF document text
    • https://rolobidixogiru.weebly.com/uploads/1/3/1/6/131637372/1680568.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421630/normal_5fe07cf1b2b55.pdfIn PDF document text
    • https://pafovawulawagi.weebly.com/uploads/1/3/4/5/134581771/xitapep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388183/normal_5fd3a44b1f9a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366399/normal_6007ec9bf12de.pdfIn PDF document text
    • https://jupoviladuxeru.weebly.com/uploads/1/3/4/3/134310568/5123921.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392195/normal_600b98619154b.pdfIn PDF document text
    • https://befadileniralan.weebly.com/uploads/1/3/6/0/136082268/dejitosupo.pdfIn PDF document text
    • https://lasemekesote.weebly.com/uploads/1/3/4/3/134314396/5966a85c193b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zegugas.pbworks.com/w/file/fetch/144692409/el_prncipe_de_las_mareas_pelicula_completa_en_espaol_latino.pdfIn PDF document text
    • http://zosajivapesi.pbworks.com/w/file/fetch/144687909/loveshhuda_full_movie_download_in_1080p.pdfIn PDF document text
    • http://pinurakus.pbworks.com/w/file/fetch/144548940/37498693967.pdfIn PDF document text
    • http://sijomirurefi.pbworks.com/f/fifty_shades_darker_full_movie_free_download_300mb.pdfIn PDF document text
    • http://famukaser.pbworks.com/f/minecraft_free_download_unblocked_1.14.pdfIn PDF document text
    • http://nigezid.pbworks.com/f/interpreting_double_bar_graphs_worksheet.pdfIn PDF document text
    • http://xifilipisi.pbworks.com/w/file/fetch/144423126/diep.io_mod_apk_unlimited_points_1.2.10.pdfIn PDF document text
    • http://gazumadu.pbworks.com/f/82732134899.pdfIn PDF document text
    • http://podimil.pbworks.com/f/bosch_300_series_dishwasher_manual.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_off0000ec4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4B 5268 bytes
SHA-256: 6de4fbfa3bcbb332f1a254723621587d4ea189d091b845f49bf7ddfe935d612f
font_01_sfnt_off0000fe1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1D 10588 bytes
SHA-256: e00ace415e8dd3a0dfda63ce897856fd7a019fa9725ccda1e114ecdf30546602

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