Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a5f88bc748b62c4…

MALICIOUS

PDF

75.2 KB Created: 2021-06-04 07:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9c53b9629df378081c864b067ae9bc83 SHA-1: edbaa4d77fd0aa99186adb0335f742b752294c6d SHA-256: 4a5f88bc748b62c4af574fc986c63b4023517f0375e7b5a2b81154fe0ffe471e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=fraction+decimal+percent+word+problems+worksheet+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4462341/normal_5fd350a5d0de6.pdfIn PDF document text
    • https://mobinefoju.weebly.com/uploads/1/3/1/3/131398425/8992835.pdfIn PDF document text
    • https://garixapevawena.weebly.com/uploads/1/3/4/4/134495328/18faadde.pdfIn PDF document text
    • https://nutolifawivu.weebly.com/uploads/1/3/1/4/131437776/voguwisevu.pdfIn PDF document text
    • https://rofubedojatedo.weebly.com/uploads/1/3/4/5/134586725/putoluwexorogigu.pdfIn PDF document text
    • https://kerusovaxi.weebly.com/uploads/1/3/5/9/135978613/7745025.pdfIn PDF document text
    • https://nugusogo.weebly.com/uploads/1/3/4/3/134319441/4352741.pdfIn PDF document text
    • https://zojujevekuki.weebly.com/uploads/1/3/0/9/130969212/piwarariwunosojeso.pdfIn PDF document text
    • https://lulitetuxopibol.weebly.com/uploads/1/3/1/1/131164377/1f5c210.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420760/normal_5fdf3bbee6c77.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/482d402f-3984-4f89-9219-963da78bfbd8/how_to_describe_your_philosophy_of_education_examples.pdfIn PDF document text
    • http://degagogo.pbworks.com/f/vutimonomebegamoxilamuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4494431d-5ba4-404d-8cac-c0afb4042611/how_to_connect_motorola_bluetooth_earpiece.pdfIn PDF document text
    • http://damopijos.pbworks.com/w/file/fetch/144595065/vampire_diaries_books_full_set.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fac5266-45ec-48cc-9380-39bf97d70e1e/what_are_catholic_rosary_beads.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/baecb7cd-b9e6-468a-a87d-2e4675581519/80295684471.pdfIn PDF document text
    • http://jujirafamena.pbworks.com/f/how_to_reset_swann_dvr_password_n3960.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE318 5644 bytes
SHA-256: 8429803f87f5c7c856db30657f932ec63b754e39da965ca38251a1738af74d8e
font_01_sfnt_off0000f62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62E 11772 bytes
SHA-256: 380f07826d7d15ada07547a1f5985979092ab9e1af83f24462697b8582c52ab5

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