Malicious PDF — malware analysis report

Static analysis result for SHA-256 42dca87e691023ad…

MALICIOUS

PDF

73.7 KB Created: 2021-04-05 09:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: db8dabb44b20854e24aa22cc2348a9d1 SHA-1: 537e5e99a9ce4297a3ccaca3be3215e3653ed57b SHA-256: 42dca87e691023ade8d7855c13f2661817ea33aed3cf6280e298a46886b92b87
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, and is flagged by heuristics as a link farm and a potential phishing/malware distribution vector. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/123?utm_term=cinema+4d+r16+trial PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385012/normal_60495698de568.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369771/normal_606578d083e2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489969/normal_60419a6a75c4b.pdfIn PDF document text
    • http://gromstroy.com/kiridenomevovimodn9np.pdfIn PDF document text
    • http://milansit.space/mejuwubuwojedurizzx0g.pdfIn PDF document text
    • https://lawagupavuraxap.weebly.com/uploads/1/3/4/6/134616311/5593189.pdfIn PDF document text
    • https://momiretet.weebly.com/uploads/1/3/5/3/135345559/393862.pdfIn PDF document text
    • http://creditpm.com/lugogilaxilodajeleviz22p1q.pdfIn PDF document text
    • https://sozagigojo.weebly.com/uploads/1/3/1/4/131454883/doraxomirebi.pdfIn PDF document text
    • https://fojefutitamok.weebly.com/uploads/1/3/3/9/133989463/zumakazodefate.pdfIn PDF document text
    • http://playmarket-online.com/wusitakene818gw.pdfIn PDF document text
    • http://megatorg.ru/norusefobiwonjfu9c.pdfIn PDF document text
    • https://latuxuxapeja.weebly.com/uploads/1/3/0/7/130739017/4c44d803a0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448345/normal_60197ab00f19c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/government_of_alberta_separation_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/stihl_fs_130_r_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/cyberpunk_2077_ps5_update_1.04.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/lawolozafutovulubotubowa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aab492b9-b256-4ad4-8fe9-4a1cd3142452/sample_treasurers_financial_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/079bbc36-28d4-4204-a8d5-e98f4f330580/11384809943.pdfIn PDF document text
    • https://s3.amazonaws.com/popisiburewixuj/how_much_does_a_tarot_reader_make.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_off0000e3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FD 4992 bytes
SHA-256: 537c906fc9540f9569eac053e50ab3475d9019b5710e6a313512972b29114e24
font_01_sfnt_off0000f4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E0 10772 bytes
SHA-256: ae0dcdbc214e3ce4834a48b56a480cfd2f613e90b3319aeb43b0cf02c3d991f5

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