Malicious PDF — malware analysis report

Static analysis result for SHA-256 819c6ddb13a233ad…

MALICIOUS

PDF

173.3 KB Created: 2021-02-28 19:46:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 58220f01cc44fa3090c7bd66b52bc0da SHA-1: 25290ee3d6087a2b04e527e120ae3129825d8f53 SHA-256: 819c6ddb13a233ad21f4d4b3eda7c17fc976316d8364035a11c7eabbbbf0d780
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier strongly indicated maliciousness, and the document's content, though obfuscated, suggests a lure related to school supplies. The presence of embedded URLs points towards an attempt to redirect the user to malicious sites, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://golowaki.ru/wix?keyword=erie+elementary+school+supply+list PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4410186/normal_5fc57ca161fc3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501634/normal_5fdd5ea2a9f75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369499/normal_600d44b3f379f.pdfIn PDF document text
    • https://rezemofojo.weebly.com/uploads/1/3/5/3/135321986/xolesirabigipeva.pdfIn PDF document text
    • http://mujoxoluvisukid.getenjoyment.net/optimate_4_bmw_charger.pdfIn PDF document text
    • http://roxifij.22web.org/75513301711.pdfIn PDF document text
    • http://suzofovolavuk.scienceontheweb.net/what_were_the_terms_of_the_treaty_of_ghent_ending_the_war_of_1812.pdfIn PDF document text
    • http://xorabawik.medianewsonline.com/h2o_mop_x5_dual_blast_steam_cleaner_with_accessories.pdfIn PDF document text
    • http://rukakev.iblogger.org/49061182456.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473322/normal_5fe27867ee538.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367914/normal_5fce5f9b982ea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sidepojedava.myartsonline.com/himno_del_maestro_venezolano.pdfIn PDF document text
    • http://danidarexixuw.epizy.com/best_special_air_service_books.pdfIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/top_android_phones_2018_india.pdfIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/aparato_digestivo_unam.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/chandannagar_weather_report_today.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/17180233427.pdfIn PDF document text
    • http://nukivamo.myartsonline.com/best_replacement_battery_for_ipod_video_30gb.pdfIn PDF document text
    • http://japonovatiner.rf.gd/nutox.pdfIn PDF document text
    • http://kuwijiti.myartsonline.com/tononuxojepuwa.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/kotigipowitu.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_off000271fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x271FB 5232 bytes
SHA-256: 8600bf64b989adf60666e14bb8d30a7b8635ab5721f21d37b279162c5cb7bc61
font_01_sfnt_off000283a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x283A6 10308 bytes
SHA-256: dbfebb812a05c0013fadaee9ddb386b00a93e5e08719b78e55b5dd501017c2fd

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