Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d59f3f7747d8cb…

MALICIOUS

PDF

97.4 KB Created: 2021-02-25 07:02:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1eb2c750d91eb8778fef37e6866c05e9 SHA-1: ff5141650d7afa17b10d80489ab350188a873f37 SHA-256: 19d59f3f7747d8cb26f2c6e3c8cd92745e95903f7466a0c95fc627a965b04b6a
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 0.9996

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://jacksth.ru/strik?utm_term=what+is+the+meaning+of+the+title+much+ado+about+nothing PDF link annotation
    • https://gupuletafajural.weebly.com/uploads/1/3/0/7/130776102/8761302.pdfIn PDF document text
    • http://nemosixumeki.mypressonline.com/96044094087.pdfIn PDF document text
    • http://gosoxegekiri.mywebcommunity.org/nada_carmen_laforet_anlisis.pdfIn PDF document text
    • https://fogebutozedelig.weebly.com/uploads/1/3/0/7/130776223/98d5b4616274.pdfIn PDF document text
    • https://cdn.sqhk.co/ridijafugemi/ghgLmjd/numizox.pdfIn PDF document text
    • http://kitafoged.medianewsonline.com/wizukus.pdfIn PDF document text
    • http://zirosax.iblogger.org/63951889149.pdfIn PDF document text
    • http://yoganchik.space/c_optional_format_specifier7d6bz.pdfIn PDF document text
    • https://cdn.sqhk.co/jilebodetifa/icXgcjj/myers_park_charlotte_nc.pdfIn PDF document text
    • http://gosoxegekiri.mywebcommunity.org/66896396845.pdfIn PDF document text
    • http://ostanni.fun/367019545792yuqf.pdfIn PDF document text
    • https://malolikekex.weebly.com/uploads/1/3/4/7/134718462/8169414.pdfIn PDF document text
    • https://cdn.sqhk.co/rekosiseweno/Cmlgijf/driving_school_sim_mod_apk.pdfIn PDF document text
    • http://musofiron.ru/wivolezojuwi9ci35.pdfIn PDF document text
    • https://geregilewupune.weebly.com/uploads/1/3/4/8/134849809/4504c6103e.pdfIn PDF document text
    • https://cdn.sqhk.co/jolodovi/jQevkBI/zombie_age_3_shooting_walking_zombie_dead_city.pdfIn PDF document text
    • http://jewlgems.com/avril_lavigne_hello_kittygoc8w.pdfIn PDF document text
    • http://copyrighytsupport.com/72672856674c69hd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://supuwevul.atwebpages.com/log_log_plot_linear_regression_matlab.pdfIn PDF document text
    • http://xosofidevutora.epizy.com/used_minn_kota_power_drive_for_sale.pdfIn PDF document text
    • http://bazogojuzularib.rf.gd/marcy_workout_bench_parts.pdfIn PDF document text
    • http://desozubavoj.epizy.com/why_leveraged_finance_wso.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_off00013e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E11 5492 bytes
SHA-256: 323e7269ab8b603ea7e0351bdfe9e7e70172c1ec5ff141ab1f4a8ae668739804
font_01_sfnt_off000150a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150A8 11880 bytes
SHA-256: e012dec53bc476e6c2ae7b9b90a5a72b808a6b5545b02bdcd941c114e0f6fabb

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