Malicious PDF — malware analysis report

Static analysis result for SHA-256 44f2c331aeedfaf9…

MALICIOUS

PDF

73.3 KB Created: 2021-03-15 06:39:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: bd6a87a6bbbd7091be528e11d6e3d39a SHA-1: ba491a79077957de4359722291ab470a9c4c048e SHA-256: 44f2c331aeedfaf97c2659a8582101760a6d485f22f94b4ac1a06949997f73d9
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF structure itself point towards an attempt to redirect users to potentially harmful websites.

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://jottigo.ru/wb?keyword=is%20tokyo%20mirage%20sessions%20worth%20it PDF link annotation
    • http://narixuz.mypressonline.com/82369634904.pdfIn PDF document text
    • http://pimifawimonidij.mywebcommunity.org/what_does_frankenstein_represent.pdfIn PDF document text
    • http://lirinevewafa.mypressonline.com/turolevodefudozeme.pdfIn PDF document text
    • http://lozipazom.sportsontheweb.net/53018552230.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393209/normal_5ff46dc15cfe6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482860/normal_5ff8018a8b104.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504568/normal_604d06e1b9770.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f8340159-69ce-4309-ac43-521e9a8475b4.filesusr.com/ugd/bc0b97_79c431d9e92d42d8a819144ccfe03c32.pdf?index=trueIn PDF document text
    • https://e05653fc-386e-4c8b-889d-738aee72c63e.filesusr.com/ugd/62421a_275b8600ee5c4c2aaca00f058cfd7244.pdf?index=trueIn PDF document text
    • https://56f9ebfc-1b58-4ccd-90b9-24793863e956.filesusr.com/ugd/0f3536_6e1fdb06ebd84d59854c508086620c0e.pdf?index=trueIn PDF document text
    • https://c6111751-42b6-464f-a8b1-832d492ff999.filesusr.com/ugd/3d0627_a3d3c4f3342f481eb1add34627b90890.pdf?index=trueIn PDF document text
    • http://wikukodukoja.onlinewebshop.net/zakisopawotogapolamalutu.pdfIn PDF document text
    • https://98be45bc-63b9-4117-aff7-84a3d4f2c4a0.filesusr.com/ugd/90c678_801e339a5c97421c8848391555ad6c54.pdf?index=trueIn PDF document text
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_227f3e7fb7024db4af0c3cf6e636d0b1.pdf?index=trueIn PDF document text
    • https://da9d63b4-fbfd-4f6f-88e7-06ac0d76355b.filesusr.com/ugd/ca300b_2afa06b826514eb9903ea0da073bcb5b.pdf?index=trueIn PDF document text
    • http://dajomilot.atwebpages.com/36045597127.pdfIn PDF document text
    • https://0f7a2101-273c-4f7f-b1fd-079d1ad923c1.filesusr.com/ugd/a7ea6f_6d56f2ea916c49f9bfdf9ca18ae9deeb.pdf?index=trueIn 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_off0000e1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B8 5260 bytes
SHA-256: a0b20dd70382b525775ce50799132ec3f777f59ddf7a88c9a29c4ba5ab9b3ab8
font_01_sfnt_off0000f38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38C 10804 bytes
SHA-256: e1ac42c2d19fb25ee4cb149fa0e1ae1f186a353d823a82e5a88fbef541d04830

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