Malicious PDF — malware analysis report

Static analysis result for SHA-256 baabb2945f9946a2…

MALICIOUS

PDF

66.0 KB Created: 2020-12-17 14:49:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 9b31e525ef5cdf3d4d1a106f504e0ae0 SHA-1: 911ce295f4a9e788e29e3713cf958da9dfeb78dc SHA-256: baabb2945f9946a217512e63d783ec0fa6682823882ecbd92d8639f4f3738934
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to manipulate search engine results or distribute further malicious content. The presence of embedded URLs and the PDF structure strongly suggest an attempt to redirect users to potentially harmful sites.

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
  • 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://trafffi.ru/123?utm_term=harvard+summer+institute+on+college+admissions PDF link annotation
    • https://bagobizofenagex.weebly.com/uploads/1/3/4/7/134767931/nerolakagus_bofefarosaxej_bazidi_degalomin.pdfIn PDF document text
    • https://kezopepeza.weebly.com/uploads/1/3/4/3/134332650/06fce0df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414501/normal_5fcb6c03761d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474205/normal_5fbc9f7fbbb6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454691/normal_5fb35507670ec.pdfIn PDF document text
    • https://xoludebule.weebly.com/uploads/1/3/4/5/134526363/deger-supubu-migowaviluxuva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464053/normal_5fb5ef5f8f6d8.pdfIn PDF document text
    • https://rawiranuxox.weebly.com/uploads/1/3/4/6/134618620/vudolal-vugepagalorawof-paraweradozar-rujodaxewi.pdfIn PDF document text
    • https://bizowubojixix.weebly.com/uploads/1/3/4/2/134265373/8e029efab276.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbfdd38a3bf4b14aba341ea/t/5fc36d3ef81c9a2a0c0de7c0/1606643006545/47678907347.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51e321a5-7443-42cc-8725-a3ef3e1347a4/gunevipel.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc380a5bd14ff0dd2ad0ae2/t/5fcb065aa3bc3d19152757b9/1607140955529/pevexorup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/286f07ae-4248-4b19-974c-99e74ca5e840/25500313683.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_off0000c75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75C 5280 bytes
SHA-256: a41a91e7b966f1471e3e74bde3ee049a8eff06142d87424d0f1efb3acc595f12
font_01_sfnt_off0000d93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93F 9928 bytes
SHA-256: c941dd900233fb1ee33c52776d018f67e08f1d7e3ab06fcf18c2f72204a2d698

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