Malicious PDF — malware analysis report

Static analysis result for SHA-256 d427e3aac704a1a6…

MALICIOUS

PDF

79.0 KB Created: 2021-03-04 23:51:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e5eec8958705c990239c408e93ec74fa SHA-1: 4b74221874803038a64357bb8bd0df200cd3fbb7 SHA-256: d427e3aac704a1a68541931f39d2e3bc4cececf1a63e2ea87188ae66ae28889e
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs, with a primary suspicious URL being https://resalured.ru/123?utm_term=yeti+x+microphone+amazon. The document body is heavily obfuscated and appears to contain junk data, suggesting it is not intended for direct user interaction but rather to facilitate the link farm functionality.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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=yeti+x+microphone+amazon PDF link annotation
    • https://mubuvume.weebly.com/uploads/1/3/4/8/134885019/pujusak.pdfIn PDF document text
    • https://rizomoxus.weebly.com/uploads/1/3/4/5/134589692/gofuladidewotu.pdfIn PDF document text
    • http://fagumawegoleleb.mypressonline.com/42903272034.pdfIn PDF document text
    • https://gixunilaw.weebly.com/uploads/1/3/1/8/131856646/nuzaxosikovifexedek.pdfIn PDF document text
    • http://warowusavi.mywebcommunity.org/35160487770.pdfIn PDF document text
    • https://jevalibiku.weebly.com/uploads/1/3/4/2/134266190/pegim.pdfIn PDF document text
    • https://wurilulisewanid.weebly.com/uploads/1/3/4/7/134728532/3458560.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/b97f75f2-035e-459a-93d1-cc670ea1e275/sasim.pdfIn PDF document text
    • http://wiloradakuno.onlinewebshop.net/excel_formulas_vlookup_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7912028b-d574-444f-955f-5d788edd8cc9/puxovas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f745718-d9fc-4ba7-a530-eb2317a187ad/safety_glasses_for_covid_19_protection.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b0de431-f97d-4e95-9ea0-b9ab4f1523f6/samsung_galaxy_s9_unlocked_price_new.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/angular_cli_8._0._2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e322e7c-c240-44ad-8201-90b85bf669a5/joe_and_charlie_step_6_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6b29f80-c0fc-4912-9811-e18a1a889ae2/rccg_sunday_school_teachers_manual_10th_january_2021.pdfIn PDF document text
    • https://s3.amazonaws.com/batiku/ng_tube_placement_procedure_note_template.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/peronifadelozotukogow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20617ffc-fa0a-4c71-88f6-1c894b5afa57/negative_scale_factor.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/67279014069.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36386dbe-0b01-4ad8-bdad-99783d786450/bulovugakap.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_off0000f8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FC 5044 bytes
SHA-256: d1433a5b05852bd54583b07d604360e505cd856df67645c64871ea55119e9fce
font_01_sfnt_off00010a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A07 10888 bytes
SHA-256: cb60cf410965dbc0beb7f7e3cc1498a6034a7dc4475683ed11c1bf18b43fee16