Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd8fa2e4c20f99e…

MALICIOUS

PDF

91.6 KB Created: 2021-04-02 06:40:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 7222237df8c54baaf8cc8449d1a62eed SHA-1: 5a9b1342d3812d1fe7af16665d4773e6ce2f7689 SHA-256: dfd8fa2e4c20f99e0e00645923d79049bca993996b59363a1fb54d2f67bad7b6
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs that redirect to external websites, masquerading as a Maytag washing machine error message. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of multiple disposable domains and link farms suggests a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 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://xezojetit.ru/aws?utm_term=maytag+washing+machine+error+e01+f09 PDF link annotation
    • https://cdn.sqhk.co/zeboxuze/6jijiif/fufot.pdfIn PDF document text
    • http://muzibatixabu.mypressonline.com/optochemical_nanosensors.pdfIn PDF document text
    • https://cdn.sqhk.co/pirujezexod/cLgenjc/wepafulubisufibunidi.pdfIn PDF document text
    • https://cdn.sqhk.co/ributexovek/Wiigigh/azamara_pursuit_cruises_2021.pdfIn PDF document text
    • http://kugewezebuvigiw.mygamesonline.org/blending_sounds_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/robimovule/gyOuqn8/62448556844.pdfIn PDF document text
    • http://gelokan.sportsontheweb.net/dutapikabaloxiwovulipa.pdfIn PDF document text
    • https://cdn.sqhk.co/dakubakasilu/iagicAV/bojekinoruditibafe.pdfIn PDF document text
    • http://rakapugijumub.sportsontheweb.net/carcinoma_escamoso_de_cervix.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/a285b1c8-f6f7-41f7-a63d-61a939fc0103/waxalerefusijewibewa.pdfIn PDF document text
    • http://lepajavawis.epizy.com/pofamalowozeruwuwudak.pdfIn PDF document text
    • https://5c2df1de-05ea-4e17-9aa3-38adc7ce3153.filesusr.com/ugd/ddd609_87824cf60bb84607bba9c9daad50f5da.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fd9a653-44b3-4ec1-a1a8-01829ae0a2eb/rowewolemafovemiko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b5fd0e2-88dd-42ec-989a-d554fe1cc0a4/17229738194.pdfIn PDF document text
    • http://zepuwiz.atwebpages.com/grade_10_analytical_geometry_questions_and_answers.pdfIn PDF document text
    • http://zafuriket.rf.gd/diy_aquaponics_design.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0840393-8f31-4f25-90ea-ef846198f986/velineon_vxl_3s_esc.pdfIn PDF document text
    • http://xuvuzonixo.onlinewebshop.net/31878625126.pdfIn PDF document text
    • http://jalijoruki.atwebpages.com/79694796261.pdfIn PDF document text
    • https://5ccda086-29c7-4024-8a93-689df1f3b89c.filesusr.com/ugd/ed8107_559aea9c29924d08985506322c3ce925.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/91ffe0e7-b558-433b-9905-32776cb15218/88483301914.pdfIn PDF document text
    • https://76f5a3e5-08d8-4581-9975-6c1b933a1845.filesusr.com/ugd/dbbd16_b148b5fc9c8948f692a32adb3480c976.pdf?index=trueIn PDF document text
    • http://xefumejar.rf.gd/how_to_write_a_research_essay_on_a_novel.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001123e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123E 5812 bytes
SHA-256: bc341e734128f5b047c4b9b9a13b1cecced016bbadcce8409b54578c4c3e6ff8
font_01_sfnt_off0001260b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260B 10884 bytes
SHA-256: a74c8a07bd990542439f8a1ed995487b8ca35e0b8bac3911afefc665fc48ae01
font_02_sfnt_off00014b37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B37 16148 bytes
SHA-256: 36f0f7c847a3d257bca3513ae5362ff552e89fccc363f2ec096b83b555007b24