Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7139a4b0b01bc7b…

MALICIOUS

PDF

81.2 KB Created: 2021-03-04 22:40:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6ad5ea5b657ca66e0e5fdd2ae900bc64 SHA-1: 50e2ab5090442a38981ce07565d24f7b918888c7 SHA-256: a7139a4b0b01bc7b55ac3916ed781ab38f4de972ff206ab1cd1848eea2b78fd8
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 0.9954

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/123?utm_term=star+trek+beyond+krall+race PDF link annotation
    • http://passive-income.ru/18742072359fjwu0.pdfIn PDF document text
    • http://gtmedis.com/what_is_a_classroom_management_plan_definitionfa27l.pdfIn PDF document text
    • http://gixapedotamerow.mywebcommunity.org/16416023806.pdfIn PDF document text
    • http://gojavodevagajuw.mygamesonline.org/what_does_a_large_sweet_potato_look_like.pdfIn PDF document text
    • http://interior.estate/40035238075kls59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477138/normal_5fdafdeb1b9c6.pdfIn PDF document text
    • http://balegetiwep.mywebcommunity.org/kitchenaid_electric_double_oven_parts.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495858/normal_5ffdeac3c799c.pdfIn PDF document text
    • http://suludosepo.iblogger.org/how_to_get_a_motion_sensor_light_to_stay_on.pdfIn PDF document text
    • http://indir-kazan.com/jandy_gas_pool_heater_reviewsstdr2.pdfIn PDF document text
    • http://zugemenelil.medianewsonline.com/ketapiliwujelevu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478414/normal_6035dc4036f2b.pdfIn PDF document text
    • http://moradudipomibo.mypressonline.com/kindle_4_battery_replacement.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472185/normal_5fcbc2f484d9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486374/normal_6014206a1c087.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://keregimuw.onlinewebshop.net/galaxy_tab_a_2016_memory_card_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7d069ee-ef65-45a2-b0f8-ef866ffc4d5c/how_many_calories_should_i_eat_for_my_age_and_height.pdfIn PDF document text
    • http://gozenabuzixi.onlinewebshop.net/tataxuwadoto.pdfIn PDF document text
    • http://labazesunug.epizy.com/nebotulotuga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3168adb-0746-4acc-9cfe-b45445ca83fa/sagopavonowovelekisivez.pdfIn PDF document text
    • http://gupizamowakop.myartsonline.com/sizuwiz.pdfIn PDF document text
    • http://kedisijusa.onlinewebshop.net/once_minutos_resumen_de_cada_captulo.pdfIn PDF document text
    • http://sidumekubasib.epizy.com/is_wolf_of_wall_street_available_on_netflix.pdfIn PDF document text
    • http://womipir.rf.gd/lumizigopuwewafisezaretam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50373093-cdd2-448c-a2a6-120065d519a8/java_8_collection_api_changes.pdfIn PDF document text
    • http://wolasuwalijite.epizy.com/looking_for_ladies_white_t_shirt_long_sleeve.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_off0000f238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF238 4904 bytes
SHA-256: af8507340a1cb8735f0e570791267120b269bafa27a96db3c19ea6c6f9e2b93d
font_01_sfnt_off000102f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F0 11196 bytes
SHA-256: 8d7cba13ac8586534127013503a454fc2be2eb00ff0aea39fcc520b9459cd6e1
font_02_sfnt_off00012908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12908 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e