Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2f4da4f368908ad…

MALICIOUS

PDF

72.8 KB Created: 2021-02-27 15:05:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1bf3c3f9f108b61af757496ceadf62e2 SHA-1: 31f2481c26dae2758982c911be63021c3cc8f01b SHA-256: e2f4da4f368908ad2319dbfb8bc74893279312d8b389644c132e99681b5e25b6
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document body and extracted URLs suggest a lure related to free music downloads, directing users to potentially malicious domains. The presence of numerous external URIs and link farm characteristics further supports a malicious intent, likely to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://seumenha.ru/award?keyword=4shar%25C3%25A9d+baixar+musica+gratis+mp3+para+celular PDF link annotation
    • http://nebofonuve.mywebcommunity.org/2543091533.pdfIn PDF document text
    • https://cdn.sqhk.co/jevamivuvugi/JohjrBC/hoverboard_images_pink.pdfIn PDF document text
    • http://gubixazolela.sportsontheweb.net/22699568986.pdfIn PDF document text
    • https://cdn.sqhk.co/wenewojufaj/awlPfhh/beacon_house_appraisal.pdfIn PDF document text
    • https://cdn.sqhk.co/difanemifal/cXGjchg/lightning_field_the_killers_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/riwaxagi/obdthdT/xipexasefuduvis.pdfIn PDF document text
    • https://cdn.sqhk.co/furigelo/ciiegid/barbecue_chicken_instant_pot.pdfIn PDF document text
    • http://viwaginuf.iblogger.org/systemverilog_queue_exists.pdfIn PDF document text
    • https://cdn.sqhk.co/zukuxenopo/fS41lhf/love_girl_undertale_aus_amino.pdfIn PDF document text
    • https://cdn.sqhk.co/sivojadirabe/ZdihhaC/operating_basketball_score_clock.pdfIn PDF document text
    • https://cdn.sqhk.co/jitolado/qRWjf46/liverpool_hd_wallpaper_for_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/jojojidatun/jggj8ic/wedufifo.pdfIn PDF document text
    • https://cdn.sqhk.co/woselukafo/Aij2ggi/wardrobe_pocket_organiser.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/89297617978.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/tikasimolulopapalu.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/5758300101.pdfIn PDF document text
    • http://tavoxelelenasi.onlinewebshop.net/fishman_loudbox_mini_charge_sale.pdfIn PDF document text
    • http://fodakobenolam.rf.gd/d-link_dir-655_als_access_point_einrichten.pdfIn PDF document text
    • http://nokakegobowu.epizy.com/korean_customs_declaration_form.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_off0000dbae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAE 5996 bytes
SHA-256: 1dd418ca467eecbacadc9c36961d30dd3235d323ceac68f75195a271e7f578dd
font_01_sfnt_off0000efac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAC 10504 bytes
SHA-256: f8bb27d99d29c2958637e18071d703c487f3ead280facc8e0c79226d8e69dc8f

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