Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f1a0c68f96f442f…

MALICIOUS

PDF

74.0 KB Created: 2021-03-27 18:40:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 9779065254e1d984fc2a0a81981fddc8 SHA-1: b3fce9ae5b44dc1a45c2a335da1a94aac6078a00 SHA-256: 5f1a0c68f96f442f0c5801b9522f8a2249546d42ba1173fc825147bdcab8343d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The presence of numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, strongly suggests a phishing or link-farming attack pattern. While no scripts were explicitly extracted, the PDF structure and URL distribution are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/123?utm_term=charminar+movie+free PDF link annotation
    • https://ganokupojedozo.weebly.com/uploads/1/3/4/8/134890080/gopulorisolodoxadab.pdfIn PDF document text
    • http://bidetoluji.getenjoyment.net/weribesagukulaxatuw.pdfIn PDF document text
    • http://bawazofo.getenjoyment.net/what_are_the_elements_of_rhythm_in_music.pdfIn PDF document text
    • http://nubuxeki.scienceontheweb.net/15511668365.pdfIn PDF document text
    • http://gomesuzos.mypressonline.com/sap_basis_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456389/normal_602472974d5d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427499/normal_5fc676e71f59c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375357/normal_6023c226ab210.pdfIn PDF document text
    • http://kozidozilujivox.getenjoyment.net/67160941258.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458622/normal_6024c1d064773.pdfIn PDF document text
    • https://wefizaxire.weebly.com/uploads/1/3/0/9/130969527/piwenukesugezepik.pdfIn PDF document text
    • https://zumugewij.weebly.com/uploads/1/3/1/4/131483128/rilerulofaxuf-ritejegipebirab-tosezuditatutur-gujuwozukuz.pdfIn PDF document text
    • http://pevewoxoxup.scienceontheweb.net/80367325461.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490516/normal_603ba9c3b1a8a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1e8c0764-4a0f-46ab-84a2-5f63a8a44928.filesusr.com/ugd/6a0acf_e5aa4cfef9ab452190dcafe06fc7bb72.pdf?index=trueIn PDF document text
    • https://6525eaf8-9a42-4119-9fb4-c3d475b3b78e.filesusr.com/ugd/80bfa9_915ad8038a334626b7e58e08d0c58865.pdf?index=trueIn PDF document text
    • http://wenulusevikofa.myartsonline.com/angularjs_generator.pdfIn PDF document text
    • http://zerowegujij.onlinewebshop.net/nufebuwosadivofigurun.pdfIn PDF document text
    • http://fazovalekotevo.onlinewebshop.net/50596148019.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_off0000e6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F6 4760 bytes
SHA-256: ee03a37c648fce85b2011efffa38cd35215fcf3ca497662b93e883180304fcb2
font_01_sfnt_off0000f6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FE 10564 bytes
SHA-256: 730e91d241e9840cf93e4ae36cdbf52c240724c7afede3824a118dd62c4db773

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