Malicious PDF — malware analysis report

Static analysis result for SHA-256 524fc69157239289…

MALICIOUS

PDF

128.9 KB Created: 2021-03-12 07:33:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 22a19d98f90c5709beef24698af5205d SHA-1: 5b0bfdff5915fcd2f1b956ea92fe8190b25dd354 SHA-256: 524fc691572392897c529eecff1266ab15a6ef1d7b1798a2ae10805c997732bf
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by 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 0.9980

Heuristics 4

  • 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://leonvi.ru/123?utm_term=collage+photo+maker+app PDF link annotation
    • http://sipipewawezizuf.getenjoyment.net/ariens_824_snowblower_shear_pin_size.pdfIn PDF document text
    • http://tipofeliluget.medianewsonline.com/renewable_and_efficient_electric_power_systems_solutions_manual.pdfIn PDF document text
    • http://joxufovogikera.iblogger.org/ponovilekanexixukitibixe.pdfIn PDF document text
    • https://cdn.sqhk.co/mabisurud/gepJrha/nufetitetuno.pdfIn PDF document text
    • https://cdn.sqhk.co/mareduviger/ljggdiN/call_of_mini_zombies_hack_apk_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/jopubelo/Hj1iajg/banana_running_shorts.pdfIn PDF document text
    • http://xidasetetobuge.scienceontheweb.net/5454130494.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/vjhER2Z/how_to_use_post_it_flags_for_studying.pdfIn PDF document text
    • https://cdn.sqhk.co/pifonode/f0diagc/45450977785.pdfIn PDF document text
    • http://memowelubi.mygamesonline.org/kenewafovilirogor.pdfIn PDF document text
    • http://nusowutevu.getenjoyment.net/50846235985.pdfIn PDF document text
    • http://boribonabone.mypressonline.com/jidikut.pdfIn PDF document text
    • https://cdn.sqhk.co/fogibadeku/oLjfMhf/freeway_insurance_company_rome_ny.pdfIn PDF document text
    • http://zomaragexavope.sportsontheweb.net/robert_kiyosaki_quotes_cashflow_quadrant.pdfIn PDF document text
    • https://cdn.sqhk.co/rekewuneboxu/phd0Ehj/20974779014.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://woruzuxolalov.rf.gd/the_avalanches_wildflower_rar.pdfIn PDF document text
    • http://posikin.myartsonline.com/wigisixurujopirowe.pdfIn PDF document text
    • http://kemesuxaw.myartsonline.com/nopurivegogenej.pdfIn PDF document text
    • http://luvabokinoleg.onlinewebshop.net/how_to_reset_a_kindle_3.pdfIn PDF document text
    • http://zobuwijezad.onlinewebshop.net/90640396172.pdfIn PDF document text
    • http://rutipozi.epizy.com/sowusikenamojugefe.pdfIn PDF document text
    • http://sudexixurijaxoz.atwebpages.com/communist_manifesto_book_report.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17929 6656 bytes
SHA-256: e1e55ea60fcd9336cace59dd0d41392dc75d69bddd1ace99e88a55d28c98e8bf
font_01_sfnt_off000189dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189DC 4776 bytes
SHA-256: 18441843355dcbcbb5198a136b6390117005690423b807637bbffe3fb9cfaf02
font_02_sfnt_off00019a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A19 3492 bytes
SHA-256: 8941e8b6ea68f1a39b900be0f317e799ded00adf53c186c05fa8cf7d194cc6d9
font_03_sfnt_off0001a83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A83F 11496 bytes
SHA-256: 9b3b6ac04d3e46078e28131fed1223fe5520c74e3360eea838712eae8a156138
font_04_sfnt_off0001cf73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF73 16592 bytes
SHA-256: 10563e75da730cc3bfc6b27562eace0e9f9cb8f26cc6e9d72b3fde72719928d0
font_05_sfnt_off0001e63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E63D 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f