Malicious PDF — malware analysis report

Static analysis result for SHA-256 45fce3a74e52f291…

MALICIOUS

PDF

75.3 KB Created: 2021-02-27 14:33:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 564240d54c06de8657f9cf81441353f8 SHA-1: 3fcfe5748a69c7a0c2f34b6c92087ad12d50a4df SHA-256: 45fce3a74e52f291be0e14c0c03fc80f4e2b3c1899864d5e3a939d585787356b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple external URIs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards a common phishing lure.

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://jottigo.ru/award?keyword=old+yeller+dog+breed+book PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4468553/normal_602357d91a03a.pdfIn PDF document text
    • https://vabuxijipureg.weebly.com/uploads/1/3/4/4/134476882/jibinemo.pdfIn PDF document text
    • http://waxodotira.22web.org/how_to_make_pink_by_mixing_colours.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451212/normal_5fc6aaeb6f88c.pdfIn PDF document text
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/9744867.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450426/normal_603118d97b4d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418783/normal_5fccf83feac70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465012/normal_600b51fa20ff7.pdfIn PDF document text
    • http://xonajolonifimo.22web.org/abominable_snowman_of_pasadena.pdfIn PDF document text
    • https://jebupamix.weebly.com/uploads/1/3/6/0/136098333/zuxomemokuvugafo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ribebipewafiwas.epizy.com/html_responsive_table_template.pdfIn PDF document text
    • http://romamosok.rf.gd/aisi_hai_tanhai_ost_video.pdfIn PDF document text
    • http://xomexopiguv.rf.gd/61497813132.pdfIn PDF document text
    • http://wijopimitiraze.epizy.com/tourist_guide_synonyms.pdfIn PDF document text
    • http://ralivapoked.epizy.com/apocalypto_full_movie_tamil_hd_1080p.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/37003139955.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_off0000ec0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0B 4936 bytes
SHA-256: 863e0185cdef393c8cbeb0d1a1126fda4a0457eb4ed34ad882f1d87e21d5ead3
font_01_sfnt_off0000fcef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEF 10464 bytes
SHA-256: cbffa535825e0f036e77ebf599ac928a182696abc4be9997568e8fe512aaa0f8

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