Malicious PDF — malware analysis report

Static analysis result for SHA-256 52d985a8471d15ea…

MALICIOUS

PDF

87.1 KB Created: 2021-05-13 19:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a0c53311d425489ca29cf4e440620f25 SHA-1: 14e9207be1433f947a0cef1874f504a266f9e1e3 SHA-256: 52d985a8471d15eac9d02b7a75e2ca8f387b7aaf88adb44f0f54b1fb459b7dcc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

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://jumiwimov.ru/strik?utm_term=how+to+replace+ge+adora+water+filter PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4402520/normal_5fcd0e5bebfe3.pdfIn PDF document text
    • http://tatemegedes.sportsontheweb.net/walden_pond_thoreau.pdfIn PDF document text
    • http://wersita.fun/10309001696mifze.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444622/normal_5ffc53061e7e4.pdfIn PDF document text
    • http://brettlockhart.com/bigo_live_connector_for_ioscjg53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373983/normal_60330ed9c1b0f.pdfIn PDF document text
    • http://life-news.tech/18914320073m7z4e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488570/normal_5ffcd1ccc7fe7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449599/normal_6015c30245af3.pdfIn PDF document text
    • http://reduslim-italiaoficial.site/traxxas_tqi_transmitter_bluetoothhfa3j.pdfIn PDF document text
    • http://paksorond.xyz/benchmark_fractions_worksheets_6th_graderm7fw.pdfIn PDF document text
    • http://smartroom.pro/what_are_the_types_of_descriptive_writingftv9u.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://duwemanuwixam.atwebpages.com/linear_search_program_in_c.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ad544b9-a82a-4a78-8d7d-d599b02e2285/gesafagorabozuj.pdfIn PDF document text
    • http://vumovofun.onlinewebshop.net/60238340836.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ada0a1d5-576c-499b-8122-ca94474a8d2e/neato_robotics_botvac_d603_connected.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c1a735d-542b-49d2-8663-6117b7510401/the_lion_the_witch_and_the_wardrobe_full_movie_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5792194f-7a04-45be-bc9e-76cb99b8d1b5/14254191448.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c5aec73-d6b8-4b44-903f-76da415f0e54/35371050651.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDE 4880 bytes
SHA-256: b481b4bc81f4f051a6884dc4203486e707a31524ec2b1e7d71cad22348f437b2
font_01_sfnt_off00011c9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9B 10680 bytes
SHA-256: 5d7ab42fd38ea302730ece8234d51df9fbdd811d7d2d797aa99616efc4f134d8
font_02_sfnt_off00014119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14119 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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