Malicious PDF — malware analysis report

Static analysis result for SHA-256 3671d8f8fc572121…

MALICIOUS

PDF

75.7 KB Created: 2021-02-28 23:28:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: bb9a0faab9f204d9a772b88b75c03eb4 SHA-1: 09e321fcb0d123ed1a26417bb2fc1269d76e9f3e SHA-256: 3671d8f8fc572121bb648810f01582d0e4becc2589e4cd560d089efdcb3e06ed
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 0.9998

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://druttle.ru/wix?keyword=osceola+arrest+reports PDF link annotation
    • http://xexapitanegis.getenjoyment.net/average_machine_learning_engineer_salary_toronto.pdfIn PDF document text
    • http://woziwowariv.sportsontheweb.net/do_native_american_have_to_pay_taxes.pdfIn PDF document text
    • http://kakafeg.scienceontheweb.net/wixamawutokawibogum.pdfIn PDF document text
    • http://robinmani.site/world_war_1_worksheets3uakp.pdfIn PDF document text
    • http://repair-kvadrokopterov.ru/kiwukukalefidosisazerin1s5n.pdfIn PDF document text
    • http://jekenufakewe.mypressonline.com/organisational_structure_powerpoint_template.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://wozawexopad.epizy.com/bumpy_ride_song_lyrics.pdfIn PDF document text
    • http://janalusexisowa.epizy.com/bokidaj.pdfIn PDF document text
    • http://tobikinos.onlinewebshop.net/who_could_that_be_at_this_hour_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/when_do_you_know_something_is_wrong_with_your_kidneys.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/crash_bandicoot_gamecube_iso.pdfIn PDF document text
    • http://fipomazuwasa.epizy.com/academic_vocabulary_for_ielts.pdfIn PDF document text
    • http://xosekube.epizy.com/37276478466.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/11193553652.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_off0000d346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD346 4588 bytes
SHA-256: 903dc6ccfab25253c9fff10aa31e6340e7def7fa93dacef29810ffe095d7900c
font_01_sfnt_off0000e2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EA 15244 bytes
SHA-256: fdd173db5c7bca57c834de6ecf3cf9edcfe3f2744a11a05089cd927676fd8295
font_02_sfnt_off00011233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11233 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e