Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1ae5d3477559d01…

MALICIOUS

PDF

78.0 KB Created: 2021-03-24 19:47:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 547cb54e21152186f8243540fa2b5c30 SHA-1: 27029dd15026ae7cde7045e67893c9c564fc314d SHA-256: f1ae5d3477559d017065a874cd0245cfc4c1f0c17f9af108c880fc4d754dec3c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm, suggesting a phishing or scam operation. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic point towards an attempt to direct users to potentially harmful external sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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/strik?utm_term=how+to+fix+chainsaw+oiler PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369775/normal_6039f06c9960f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415783/normal_5fdbc447aa583.pdfIn PDF document text
    • https://nozodipipagim.weebly.com/uploads/1/3/1/4/131438171/pozobevan_godejazeletilu_tatoge_vorafisa.pdfIn PDF document text
    • https://cdn.sqhk.co/bexutavukaro/gtUM8gd/4358521160.pdfIn PDF document text
    • https://wibugosavuzatug.weebly.com/uploads/1/3/4/3/134349607/kidonawezese-fuxoreteda-rarutujoza.pdfIn PDF document text
    • https://cdn.sqhk.co/tovipovo/GHMjdzK/werewolf_the_apocalypse_video_game.pdfIn PDF document text
    • https://mitenipup.weebly.com/uploads/1/3/4/3/134363071/070989eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384046/normal_5ff65e6b9b495.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502833/normal_6004f40880729.pdfIn PDF document text
    • https://cdn.sqhk.co/zazifutunoj/exicpyQ/12895226877.pdfIn PDF document text
    • https://cdn.sqhk.co/gisepavuv/VBXhhRW/game_of_thrones_beyond_the_wall_ios_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390068/normal_60113e353912c.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/1a15cd40-5013-4e81-904c-d3110e56e52e/91567507562.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac763a61-64f9-4312-a316-6feca44b53b8/dirinitosejud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b4f1e55-74c3-4c64-a2b6-44ea68e7c671/what_percent_dividend_does_apple_pay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3678f30-7923-4257-89fa-8edd6a1bd1d2/the_chrysalids_audio_chapter_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f8692f9-5184-4d13-9758-8e6bc8010f98/15313068852.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da96acf5-a9c7-4c79-b21f-5173d3a4e81a/besikudeferanikefo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93299d4e-d39f-4df1-91ee-0f5d3bd39d68/3_metros_sobre_el_cielo_2_pelicula_completa_descargar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/946a4714-f867-478a-83d4-8ea74ebd29a9/what_to_expect_on_algebra_1_eoc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4a0c144-6d3c-46f8-9824-7c2cd00fe8b0/what_size_tires_does_a_2012_toyota_highlander_have.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_off0000f5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C5 5088 bytes
SHA-256: 64211d07345224faa91111eb115cfee666729adb51101b96c6b916a911832a49
font_01_sfnt_off00010725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10725 10360 bytes
SHA-256: b8984ea177b18133aa81f111a4c460fc99f03265745e55ce1e59f6dcf2a7b025

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