Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3f45aed7c9067f3…

MALICIOUS

PDF

84.2 KB Created: 2021-03-24 22:08:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2764c13ba4755de87e1a4c9326416ad5 SHA-1: 2122481f5c7c14b07e2fed7c65daee542c3bf20c SHA-256: b3f45aed7c9067f3bf1186d928ffdd24d6b216ed357d666ca51a173743c14435
126 Risk Score

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 0.9995

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://dafemum.ru/strik?utm_term=sp+racing+f3+pwm+setup PDF link annotation
    • http://bukapim.mywebcommunity.org/how_to_pair_a_fitbit_charge_hr_with_iphone.pdfIn PDF document text
    • http://zitukuwekoba.sportsontheweb.net/meladeduk.pdfIn PDF document text
    • http://riwuvodobopexu.mywebcommunity.org/frozen_shoulder_rehabilitation_protocol.pdfIn PDF document text
    • http://rubewox.sportsontheweb.net/current_affairs_in_english_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/zofagopipowi/gciaq58/31191012485.pdfIn PDF document text
    • http://lidogikezedeba.iblogger.org/zunabipasonebijiburos.pdfIn PDF document text
    • https://cdn.sqhk.co/dufelogaruf/KhfieMG/21542803959.pdfIn PDF document text
    • http://fojudesekuxujef.22web.org/grammar_translation_method_articles.pdfIn PDF document text
    • http://lumufurisazela.mywebcommunity.org/rinnai_ruc80i_error_codes.pdfIn PDF document text
    • http://fidafevemikiwe.mywebcommunity.org/82281951036.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://noxofovamoz.epizy.com/diabetes_epidemiologia_2020.pdfIn PDF document text
    • http://nisetekotixob.myartsonline.com/vexazanotixu.pdfIn PDF document text
    • http://riserapewu.epizy.com/97688124255.pdfIn PDF document text
    • http://masusoxowep.onlinewebshop.net/6208890272.pdfIn PDF document text
    • http://wimixuv.epizy.com/47235767518.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/bullsf_game_client_links.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/duweketafavu.pdfIn PDF document text
    • http://pufalidupoge.epizy.com/vilis.pdfIn PDF document text
    • https://s3.amazonaws.com/lekezaru/cipp_e_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xukirizugukugi/how_to_use_thermometer_safety_1st.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/gozijidilotoxila.pdfIn PDF document text
    • http://zigetolerup.epizy.com/antigenos_febriles.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E2 5664 bytes
SHA-256: e14c3d6f24f140ee2a4d5ef6faaafb3a03931786ee5afefe850c44e51be4243d
font_01_sfnt_off0001092d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092D 10508 bytes
SHA-256: 7aa10e0dac1ea6263d71a9b3ee064af418c2f581cca9aed887dbc10f9429157c
font_02_sfnt_off00012d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5F 16340 bytes
SHA-256: 8680b359cba86e2f6e9a78cf8c0f9e51b009e062d62f51157c34cd29f25a410b

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