Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a3aa4a70d68002…

MALICIOUS

PDF

77.9 KB Created: 2021-04-03 06:33:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a688baa6ee26503b50d948f1ccfb7e34 SHA-1: 54135418860f03b2b7fd2fd12ebf2f8e512518b4 SHA-256: a1a3aa4a70d68002f1824276fa171c696fecb335b81d63dee0ab9b62046bc52f
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://jottigo.ru/123?utm_term=dantooine+incursion+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4468274/normal_605113c8cd687.pdfIn PDF document text
    • http://bimizuzi.sportsontheweb.net/madwoman_in_the_attic_novel.pdfIn PDF document text
    • https://cdn.sqhk.co/rekewuneboxu/jgjehgo/velodrome_d_hiver_film.pdfIn PDF document text
    • http://kedepoba.sportsontheweb.net/fundamentals_of_python_from_first_programs_through_data_structures.pdfIn PDF document text
    • https://cdn.sqhk.co/kopenanum/ChcDAWG/gqom_instrumental_beats_2019_download.pdfIn PDF document text
    • http://vinograd.io/baby_toilet_trainer4uk65.pdfIn PDF document text
    • http://itsamorem.com/jezinaposinuvirigagatonay9yk4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480402/normal_6036cb9d6bece.pdfIn PDF document text
    • http://wifejopoxakobo.iblogger.org/lemeriwomoxomol.pdfIn PDF document text
    • http://life-news.tech/bose_acoustimass_15_series_ii_home_entertainment_speaker_systemh5zcp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391317/normal_601632bdc6ec3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425768/normal_5fd0d840d574a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383475/normal_60353b7133d29.pdfIn PDF document text
    • http://tulutita.sportsontheweb.net/cause_and_effect_worksheets_grade_6.pdfIn PDF document text
    • https://cdn.sqhk.co/gabixeme/jdhdvgf/kirajojirelifuva.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vadowudikimaj.epizy.com/barcelona_fixtures_2020_19.pdfIn PDF document text
    • http://lufiwivumijej.myartsonline.com/fimaribazuxapiwof.pdfIn PDF document text
    • http://xotopusedewix.myartsonline.com/bogoroditse_devo_part.pdfIn PDF document text
    • http://jumepenitujox.atwebpages.com/83743900500.pdfIn PDF document text
    • http://lesidiwajenowil.myartsonline.com/fexarenusaguvopaliwasol.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_off0000f420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF420 5076 bytes
SHA-256: bfa01125fa1bc8d54a82bcd3e89418d77d4def8d14bdf1057930ef84d00920d2
font_01_sfnt_off00010574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10574 10904 bytes
SHA-256: 66d741e9362b9b72d9edbfb5c5b41bb8e6f0462a23368b856eaa74a3c6188794

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