Malicious PDF — malware analysis report

Static analysis result for SHA-256 8083a95e907d4696…

MALICIOUS

PDF

80.2 KB Created: 2021-03-24 04:22:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ea42d07b829c1f00e275c19807393cd5 SHA-1: 85219f74ed60aea7d2423e89bdcfe0bb43887b66 SHA-256: 8083a95e907d4696ddc5a6b731f263b5a6bf95f6ac60cc3908df0113a44f6c0d
146 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. It uses an "enable content/editing" lure. 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 0.9990

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://resalured.ru/award?keyword=convert+pdf+file+to+word+zamzar PDF link annotation
    • https://cdn.sqhk.co/towinomer/fI21uUT/jenotuxesituvepofugulo.pdfIn PDF document text
    • http://semowatuk.iblogger.org/63273073648.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371800/normal_5fc6740ea1b72.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367941/normal_5ffeacb553409.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488555/normal_60263c74803d3.pdfIn PDF document text
    • https://cdn.sqhk.co/bofimekowadu/bijd8jh/detinasopuw.pdfIn PDF document text
    • https://cdn.sqhk.co/kojetozativ/fejgajb/crashmetal_ios_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/lepemafe/giarheu/uber_driver_sign_in.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375344/normal_6042f8d3f3449.pdfIn PDF document text
    • http://modusebipiz.iblogger.org/ipad_mini_4_price_philippines.pdfIn PDF document text
    • https://cdn.sqhk.co/zujumatatub/jaggohe/lebara_sim_card_activation_germany.pdfIn PDF document text
    • https://cdn.sqhk.co/guzoladip/ifjdjbB/game_of_thrones_4k_wallpaper_for_mobile.pdfIn PDF document text
    • https://cdn.sqhk.co/givifevulo/LggZWhb/turkey_ringtone_download_for_android_phone.pdfIn PDF document text
    • https://cdn.sqhk.co/nivunufozub/FXhe7ai/kobifikape.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449996/normal_603bd14185334.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f2182bdb-ca8e-4fe7-b379-f84e14eeb57e.filesusr.com/ugd/026bcc_7db526451c7f43a4b33ae5cb31d950a4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/834cf3fe-fe65-4ba1-878f-b4b79262b6fd/65612879952.pdfIn PDF document text
    • http://kotutuvotijol.rf.gd/coca_cola_financial_report_2016.pdfIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_6688878366ec4807b47ce0f131782b6f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0db94d3e-1d06-47a3-88d8-e0c0591d583e/dell_inspiron_3847_i5_motherboard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e57b90e1-6a57-4ab5-8c9f-cfc77cd1cb61/wolugomikoma.pdfIn PDF document text
    • http://zalupadinukoz.rf.gd/macro_perspective_of_tourism_and_hospitality_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b502e9a9-1491-4081-9f8b-8027c8f7066c/14335254335.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0a03b49-b76a-492b-a969-5c1a5b13db80/83844821143.pdfIn PDF document text
    • http://loxogosune.rf.gd/how_to_change_a_primer_bulb_on_a_poulan_chainsaw.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_off0000fc06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC06 5116 bytes
SHA-256: aa99d45504bdc21c92a982a7e398c157d639a67cf2f95184488a5babf0a945d1
font_01_sfnt_off00010d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D75 10884 bytes
SHA-256: 0d4f65c40e77e8ac35060de8405baf5b2f1cca06298650ec24d66f27ffdc8954