Malicious PDF — malware analysis report

Static analysis result for SHA-256 b730127b99a7322a…

MALICIOUS

PDF

73.7 KB Created: 2021-04-03 22:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 79d3f9221eea4c2fe5420565e68a4799 SHA-1: 6cccd4836928346a8b8ace38760bc48b1e65601e SHA-256: b730127b99a7322a3701de2c75c96baf791b868154edbe16100cf2bb292a4b73
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 as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The presence of 'utm_term' in one of the URLs further supports a campaign-like distribution strategy, likely intended to redirect users to malicious sites for credential harvesting or malware delivery.

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://gimoguvi.ru/strik?utm_term=fiddler+on+the+roof+movie+story PDF link annotation
    • http://gujufifirisin.22web.org/98789217125.pdfIn PDF document text
    • http://fesilax.22web.org/datugafasenodunagoloxafa.pdfIn PDF document text
    • http://luziniwanemek.sportsontheweb.net/lezoweba.pdfIn PDF document text
    • http://peuly.xyz/how_many_cubic_feet_is_a_super_capacity_plus_washershbch.pdfIn PDF document text
    • http://gidujoluj.mypressonline.com/small_review.pdfIn PDF document text
    • http://metazoaapc.fun/galileo_telescope_setupwao0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391636/normal_601f77913dfc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473919/normal_605ff1575a895.pdfIn PDF document text
    • http://theplafond.xyz/venowejesujb5zop.pdfIn PDF document text
    • http://tamasolesodaj.mypressonline.com/68699487124.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472763/normal_604a2640a5dec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498868/normal_5ff389805dc5e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rexefobixavater.myartsonline.com/xijufazoke.pdfIn PDF document text
    • http://jufamupubo.epizy.com/cuore_nero_amabile_giusti_download.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/vagasozufudurerex.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/gentleman_s_guide_songs.pdfIn PDF document text
    • http://bejuxufuvojofa.rf.gd/89838246025.pdfIn PDF document text
    • http://fatifosavo.rf.gd/accountant_experience_letter_format.pdfIn PDF document text
    • http://jariluwalube.epizy.com/cisco_ccie_voice.pdfIn PDF document text
    • http://rewuwuja.onlinewebshop.net/what_is_nash_equilibrium_example.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/full_information_of_computer_in_marathi.pdfIn PDF document text
    • http://vanudedu.epizy.com/25045820629.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_off0000e5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AF 5052 bytes
SHA-256: ce8cac5e7358fa14e3b2509ce9e0c1f84bb9ac085ec07a14b144feed17f0c08d
font_01_sfnt_off0000f6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C8 10160 bytes
SHA-256: 4456751a3a687a4e379ed138bd84f6caec61867c9388214d9a35685d092bde46

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