Malicious PDF — malware analysis report

Static analysis result for SHA-256 0053b45787015aee…

MALICIOUS

PDF

91.3 KB Created: 2021-03-19 22:11:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 22dbccd4a0892c2c9e349d4d1bc96b97 SHA-1: 1e9ccdcf69a08e7bb4693f59f4263e8347c9420d SHA-256: 0053b45787015aeecc0cecaae160b2816ad319bb17e0f6cea21757612afd0c56
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 embedded URLs pointing to a link farm hosted on disposable domains, suggesting a tactic to manipulate search engine results or distribute malware. The document body, though heavily obfuscated, contains metadata related to PDF creation and a keyword search, reinforcing the link farm and SEO manipulation hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/award?keyword=near+infrared+spectroscopy+principles+instruments+applications+pdf+free PDF link annotation
    • https://webegerux.weebly.com/uploads/1/3/4/7/134759049/tusisexejov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417530/normal_5fd09bdfd50a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450034/normal_6027fbd493285.pdfIn PDF document text
    • http://wemuwetafivaxe.sportsontheweb.net/phonak_brio_3r-312t.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/molarity_formula_chemistry.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503578/normal_5fff505cbd7bd.pdfIn PDF document text
    • https://todilotifobaw.weebly.com/uploads/1/3/2/7/132712516/f0bace4a1f999.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393359/normal_5fdc5e01c7d17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368758/normal_5fd8cdb973e3b.pdfIn PDF document text
    • http://xasedogamif.mypressonline.com/ncert_biology_book_class_11_download.pdfIn PDF document text
    • http://wejuveziwep.mypressonline.com/sonulejezorenewixineto.pdfIn PDF document text
    • https://puponefunojubuf.weebly.com/uploads/1/3/4/6/134670615/74227a9665.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://lijowavatajo.myartsonline.com/ecstas_online_light_novel.pdfIn PDF document text
    • https://s3.amazonaws.com/gogoxowiniza/kidotifogoborifox.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/rusup.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/lipelu.pdfIn PDF document text
    • http://vawirir.atwebpages.com/5985792597.pdfIn PDF document text
    • https://c4e42e93-254c-4ba8-b495-737f84002742.filesusr.com/ugd/ddb60a_6c6741030f7143f89c0b467eaabf8ad5.pdf?index=trueIn PDF document text
    • https://d2ea4bfc-f92a-4379-acf2-d9b69981ddb7.filesusr.com/ugd/739437_687c4bc772484abcb6c63b0f1c35ce3c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/limewub/year_4_maths_division_worksheets.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001178a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178A 5252 bytes
SHA-256: 954f73dc881cde3bbdc9c69e47bf4f9f26e5e26c63769eaff8a8ec8bb6bc0fe1
font_01_sfnt_off0001295a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295A 11936 bytes
SHA-256: 35a94f958dcd2b40304fc7fc1d2d83232740aa42dd35952b97485aa0d9c2fd63
font_02_sfnt_off000150b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150B7 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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