Malicious PDF — malware analysis report

Static analysis result for SHA-256 00b24199a5ceb422…

MALICIOUS

PDF

70.0 KB Created: 2021-06-10 07:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f6ddc7bb0f6c3a3d06d38bbdd905fe70 SHA-1: bb2ae1825fdf36f4980ad5d3ed9cdf084b62494e SHA-256: 00b24199a5ceb422c6a3a94ade64cd2f032fb53b4b1980196151aafec3f4e6a9
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 detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'ponafet.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host many links on disposable domains, likely for SEO poisoning or to obscure malicious destinations. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/123?utm_term=adverbs+sheet+year+6 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4467936/normal_6032242ba065d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459929/normal_6057dc735c487.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450160/normal_6056e9057539c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420470/normal_5fcf4a033294b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://komogabovuwa.pbworks.com/f/gilusejowuvuloxave.pdfIn PDF document text
    • http://nugewus.pbworks.com/w/file/fetch/144810495/gonof.pdfIn PDF document text
    • http://gifavipa.pbworks.com/w/file/fetch/144610239/monografia_psicologa_forense.pdfIn PDF document text
    • http://vogituvu.pbworks.com/w/file/fetch/144896262/inventory_checklist_excel.pdfIn PDF document text
    • http://visetululiv.pbworks.com/f/how_to_pass_rn_nclex_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6eda831-1f7a-4da3-9dbb-e971e8668e59/bonolitupedodaxuvudigudin.pdfIn PDF document text
    • http://likanegi.pbworks.com/w/file/fetch/144905751/40044124973.pdfIn PDF document text
    • http://ralogotuxa.pbworks.com/f/how_do_i_connect_my_ilive_soundbar_to_my_lg_tv.pdfIn PDF document text
    • http://keborekudud.pbworks.com/f/naruto_the_last_fixed_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da90cec1-cff2-4356-87f6-cc24eb18a102/yurbuds_leap_wireless_earbuds.pdfIn PDF document text
    • http://jolunatimavu.pbworks.com/w/file/fetch/144582519/fodegojajawakesag.pdfIn PDF document text
    • http://lalakabazu.pbworks.com/w/file/fetch/144663690/what_was_the_first_nancy_drew_game.pdfIn PDF document text
    • http://geviwesizar.pbworks.com/f/prepositions_test.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_off0000d395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD395 5324 bytes
SHA-256: 09459ce4bb748e72de00f2af3b86516c46f38f9b16defd01bcc230ed518840b5
font_01_sfnt_off0000e5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B7 10968 bytes
SHA-256: 01eaeda7a5b5aeb34970c660fa80da87ae6cbf5190752e325b64925b1591917b

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