Malicious PDF — malware analysis report

Static analysis result for SHA-256 99231c37b548046c…

MALICIOUS

PDF

83.7 KB Created: 2021-05-04 00:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 28666456462282e71a9bd06d7ff96969 SHA-1: 96d7e34b77a9add1835f14cbfff56ba70c6c0dd9 SHA-256: 99231c37b548046c6386b8d492d208ae95a809d27c04432ae05fbc2315f9bd42
192 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to web development tutorials, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crophysi.ru/strik?utm_term=html+css+bootstrap+website+tutorial In PDF document text
    • http://surupumigo.mypressonline.com/most_important_appropriate_preposition.pdfIn PDF document text
    • http://moxegelubopidi.sportsontheweb.net/56068209091.pdfIn PDF document text
    • http://fojefojegut.medianewsonline.com/rapepumaragokuzaz.pdfIn PDF document text
    • http://korefubelexusiz.medianewsonline.com/gadanujidezemuxami.pdfIn PDF document text
    • http://blancer.xyz/415236401471lsp4.pdfIn PDF document text
    • http://dvigatel.guru/45335249706m01r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0e733887-fd72-4d21-8b10-0a39cafbc931.filesusr.com/ugd/1e4d10_178c984f4f7d4eafb2f4d8216d85c59c.pdf?index=trueIn PDF document text
    • http://nejarisiwudu.atwebpages.com/simple_regression_analysis_example_excel.pdfIn PDF document text
    • http://fobilal.rf.gd/6017021440.pdfIn PDF document text
    • http://tiruweditivunaw.myartsonline.com/puvizewivupuvimiraj.pdfIn PDF document text
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_35bc4744581147b7b46ec364faf7abc2.pdf?index=trueIn PDF document text
    • https://e5058785-d3d1-442e-b0ad-d0045053dde7.filesusr.com/ugd/17c622_a42819e106484e9988c31819c1da75e8.pdf?index=trueIn PDF document text
    • http://sonedef.epizy.com/easy_hidden_pictures_printables.pdfIn PDF document text
    • https://3568c1c9-c281-4b9a-9ea9-d5d291e0176b.filesusr.com/ugd/e5d8db_86da72273b2d4175855661d48abb2ddf.pdf?index=trueIn PDF document text
    • http://lugavatakavupo.rf.gd/54239186160.pdfIn PDF document text
    • http://fonajuwowo.epizy.com/56796377530.pdfIn PDF document text
    • http://goziwofa.rf.gd/ac_dc_audio_songs.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_off000104e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E3 5272 bytes
SHA-256: e91a3ab28b5cd3f63c864ba2bb7088aad19586e339e87850b6b84ab9cff27424
font_01_sfnt_off000116c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C4 12000 bytes
SHA-256: a3823c635db47463d32a603b31338e43c7b73ece21e2be3b88ac7607545f4bd0

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