Malicious PDF — malware analysis report

Static analysis result for SHA-256 f83c728aa9a5e98d…

MALICIOUS

PDF

70.5 KB Created: 2021-06-04 21:37:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 69869c4153f1b5afbd62aea6dcd4d592 SHA-1: df7bd5678830191749c011f573d269e333d2021e SHA-256: f83c728aa9a5e98d73b97ca31ea7bc136d580950acfae7873f2ecd80fc0f71dc
186 Risk Score

Malware Insights

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

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 0.9961

Heuristics 6

  • 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 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.
  • 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://inwebjor.ru/pbw?utm_term=maisto+megatropolis+mega+playset+assembly+instructions+video PDF link annotation
    • https://nosokubidudat.weebly.com/uploads/1/3/4/3/134321305/90e35e0938.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408184/normal_6027f3041eb2f.pdfIn PDF document text
    • https://gekowodi.weebly.com/uploads/1/3/5/3/135321574/tavizasi_jijuvogalafi.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4426675/normal_60b3fd64a8237.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486748/normal_601bb9a291da8.pdfIn PDF document text
    • https://limulepaxot.weebly.com/uploads/1/3/1/3/131379958/misagelakogoge_lenirum_pobat_widujoxud.pdfIn PDF document text
    • https://fejawizekojiwi.weebly.com/uploads/1/3/1/4/131438151/be052200319a.pdfIn PDF document text
    • https://bazanepuxakelu.weebly.com/uploads/1/3/4/3/134346533/zikeve.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423137/normal_5ff69cafc1c99.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/5d56877a-073f-4919-b459-b92b242b76cd/how_to_remove_the_battery_from_a_samsung_tab_4.pdfIn PDF document text
    • http://jujupaw.pbworks.com/w/file/fetch/144565476/bma_report_fees_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00d59ee6-f217-4c7e-85be-24914ea20719/pawududenezelogu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aee90426-f380-4bfc-9fd1-8950dd8f34e2/can_you_download_microsoft_access_for_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/975b1a08-1e0b-44c5-82fb-c62bbb84a8e7/fujifilm_finepix_s1500_sample_photos.pdfIn PDF document text
    • http://tisowowuduwe.pbworks.com/f/88418515280.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5359865-e512-470a-a052-bd18baea196e/how_do_i_schedule_an_appointment_to_get_my_drivers_license.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a898ac9-fc04-4d51-92be-80ff0b3fe47b/minecraft_guide_to_survival_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f64ff79-d92e-4cd7-9475-5de9dbbe5637/zapuni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b802b6a5-e20e-4770-bb65-df7421ca37b3/machine_learning_python_package.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1e5ba9e-77f0-4d19-bf6f-4898dde9aeb0/worksheet_answer_key_biology_cladogram_analysis_worksheet.pdfIn PDF document text
    • http://vananizi.pbworks.com/f/how_to_get_free_robux_app_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afc14d47-366f-474a-b2f8-a0606e8526ed/490240929.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8fba602-e7f9-4f23-9a07-e1b614da1e22/jesus_be_the_center_bethel_lyrics.pdfIn PDF document text
    • http://jabodawo.pbworks.com/f/dedesamumu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b293e3b7-8b11-4575-b3df-f8a06227bda1/honda_civic_auto_shopping_global.pdfIn PDF document text
    • http://pejuzor.pbworks.com/w/file/fetch/144551799/ako_uva_ashwagandha_churna_na_church.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_off0000d5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AA 5700 bytes
SHA-256: fbdad5144a28e9f37175c5d7ac9e8904c158f128329ba2c89bace2b194b5df5a
font_01_sfnt_off0000e911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE911 10108 bytes
SHA-256: 2cf42ec2239de3ae4b78f46db90b6e2c9b623b36cc39933c1472f850778fcdae