Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d80ea48cb05b35…

MALICIOUS

PDF

76.1 KB Created: 2021-03-13 19:26:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0c42ae96a8270a1de1159b475a87da21 SHA-1: 948586935ca92f36b39fb9dc2278eb29db8cc451 SHA-256: 83d80ea48cb05b3523f1207e77eec68482a7ca239e79638e7c4aec215d1ad4af
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 0.9960

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://jumiwimov.ru/123?utm_term=superman+logo+template+for+cupcakes PDF link annotation
    • http://rejorevubirobu.sportsontheweb.net/ge_true_temp_oven_heating_element.pdfIn PDF document text
    • http://sesizuxewewax.mygamesonline.org/12478269476.pdfIn PDF document text
    • http://rejamar.sportsontheweb.net/cuanto_es_1_32_en_mm.pdfIn PDF document text
    • https://bazajiwudimikot.weebly.com/uploads/1/3/4/3/134344454/9311193.pdfIn PDF document text
    • http://fonareru.22web.org/byzantium_2012_movie.pdfIn PDF document text
    • http://zujirekirel.22web.org/pepewakonavetonutosoven.pdfIn PDF document text
    • http://deladinabixek.sportsontheweb.net/bhavani_ashtakam_in_tamil.pdfIn PDF document text
    • https://zedurobarudavur.weebly.com/uploads/1/3/4/0/134018347/ec58b66172.pdfIn PDF document text
    • http://tufofol.medianewsonline.com/mifonijoneriturefenu.pdfIn PDF document text
    • http://geloritiveda.mygamesonline.org/wd_my_cloud_admin_log_in.pdfIn PDF document text
    • http://zodelem.mygamesonline.org/what_is_the_message_behind_the_national_anthem.pdfIn PDF document text
    • https://wovukevaz.weebly.com/uploads/1/3/4/5/134523328/9183112.pdfIn PDF document text
    • https://sumeropesoxiv.weebly.com/uploads/1/3/5/3/135316328/munonosofasosegijij.pdfIn PDF document text
    • http://dirozigumifew.scienceontheweb.net/acting_scripts.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/18e85875-c7ac-41b2-8847-4878d2d564c1/kwikset_910_wont_connect_to_smartthings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4d63ec9-d711-4b26-afc2-bc5dce394fcc/79311168692.pdfIn PDF document text
    • http://rabatelekovufar.myartsonline.com/how_accurate_is_the_16_personality_test.pdfIn PDF document text
    • https://75cc4b12-69da-4024-8422-75f9303faa99.filesusr.com/ugd/d6c222_e125097dc83a4b41b6da0b06daa00f2f.pdf?index=trueIn PDF document text
    • https://9f5bcc56-a059-4f00-ae85-604acd6a3d2d.filesusr.com/ugd/ac9354_48f4fdf622ce4d9ea1bec61e14f07dae.pdf?index=trueIn PDF document text
    • https://e6f9d1db-9bad-45ba-a188-0e8e378e8087.filesusr.com/ugd/99b222_254376ad61e64d0db8449d539d72455e.pdf?index=trueIn PDF document text
    • http://vigexosav.myartsonline.com/how_to_connect_iphone_to_home_wifi_network.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eba9e949-18b6-4cb4-be43-a4ac1ce39ec3/grammar_activities_for_esl_students.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d031b59a-466f-4b21-baea-e637e65ba63b/pijakali.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f681097-c0dc-4741-a159-1c38bd4cde6b/how_does_a_portable_air_conditioner_window_kit_work.pdfIn PDF document text
    • https://72858ab8-d36f-4bc2-b208-e5ec56e76d01.filesusr.com/ugd/3a4e0e_42ad1cd4bdf648daa4f1c24c153f4683.pdf?index=trueIn PDF document text
    • https://ac65beef-1c88-4b01-a948-251493ed82f2.filesusr.com/ugd/09857b_a9a236fd03074b02b2afa2cd5581cbc1.pdf?index=trueIn 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_off0000ee06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE06 5504 bytes
SHA-256: b112d3f10fe65430bcfb0c9bcef8d59fa7218317026af3bf74d5792cefa7abd7
font_01_sfnt_off000100a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A9 9956 bytes
SHA-256: 9738ddc4b14df98cd70f4f3ac358dd31a994a9a01124575989fed6c1f6a66681