Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c5d59fdd16f450…

MALICIOUS

PDF

76.2 KB Created: 2021-03-28 16:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a2e86ec9842478787e07a171672fe0bd SHA-1: 52f9d01ee6a163c0c39f448132bbd72020b2a1f4 SHA-256: f1c5d59fdd16f4506cab57eb998c693c95256311ab467f46fbfb83f1571d3890
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an MFA/2FA-themed 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 0.9956

Heuristics 7

  • 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 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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://resalured.ru/123?utm_term=icloud+photos+on+android+tv PDF link annotation
    • http://bioforce-co.site/who_is_egg_in_a_knight_of_the_seven_kingdomsbe16q.pdfIn PDF document text
    • https://remurefovedelag.weebly.com/uploads/1/3/1/8/131860204/sukeja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497695/normal_600fc56d1506d.pdfIn PDF document text
    • https://fiwugoxatalaj.weebly.com/uploads/1/3/4/4/134498599/rusubukemo.pdfIn PDF document text
    • http://slmit.space/adnoc_salary_20086crmh.pdfIn PDF document text
    • https://penabapemuzoji.weebly.com/uploads/1/3/1/4/131453208/9682060.pdfIn PDF document text
    • http://20970907.net/how_to_calculate_the_speed_of_an_object8yua2.pdfIn PDF document text
    • https://vimikova.weebly.com/uploads/1/3/1/4/131437612/1893729.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369768/normal_5fd0a3a36e9c7.pdfIn PDF document text
    • http://silkhfig.bid/laguro5zadg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365570/normal_600eb5853a133.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375704/normal_5fe4545279460.pdfIn PDF document text
    • https://relugudikovok.weebly.com/uploads/1/3/4/2/134265752/17d44d38b1b.pdfIn PDF document text
    • http://instofficial.online/60021071240dkdj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_b2aa4dcba7f24b00b07118426e3fbdc8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e3e0d53-b80a-4b85-bae7-255cf7a7675d/losipem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c10b31a-544b-4905-967e-125a1f48b3a5/fomifubodorutofozo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caf18866-25bd-4cf1-abd5-d3ff6b35c470/powelogusaxiwizeteb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00c32b69-9921-4e62-80db-9d9d3b3a0829/whiskey_words_and_a_shovel_3_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa7e34c3-b091-4154-a3d4-2538494d827c/sims_4_patch_november_2020_crashing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/417504e9-9e1b-4faa-8a29-0af7991b5e05/qual_a_populao_total_do_brasil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b183c78b-1718-42b9-aeef-ac99aabd3044/what_jobs_can_you_get_with_electrical_engineering_technology_degree.pdfIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_3e48d608f1c34a9ca59b1f1205423c5b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/40fdae75-cfe4-46ea-ae09-ca8129b386a2/carry_on_wayward_son_rainbow_rowell_release_date.pdfIn PDF document text
    • https://d12e84a0-9808-45da-82c6-613dfe540d1b.filesusr.com/ugd/dc8a8e_f246d73dcfb6462089f1ceb1906456f5.pdf?index=trueIn PDF document text
    • https://4b98dde3-f65d-4e11-807b-d4501949e87b.filesusr.com/ugd/4a7ebd_ad43d3a60e804b92bc26f59f5a096826.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_off0000ec8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8C 5156 bytes
SHA-256: f42c2011243f640e2f231e48efaa1ed408a7db7dcfea9dec6d4e79643d7a0144
font_01_sfnt_off0000fe15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE15 11112 bytes
SHA-256: b8e51c0ece75911ba7e12034b519a5fc9f2da3d66ee7a968afb4d7282b299615