Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd4b6c46c556022b…

MALICIOUS

PDF

78.7 KB Created: 2021-01-26 12:53:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 472ed06519bf25c36654baceb3494860 SHA-1: db22963368762d2ab534b56b8260345547f9cf25 SHA-256: dd4b6c46c556022bebd78f15e4e4798240f3c2e9d89dfdc506e014bd4de14771
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable hosting, characteristic of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document is part of a phishing or malware distribution scheme.

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://traffine.ru/123?utm_term=mt+desert+island+high+school PDF link annotation
    • https://cdn.sqhk.co/kisibijobu/8axnaH9/bbq_sauce_for_chicken_wings_in_oven.pdfIn PDF document text
    • https://cdn.sqhk.co/gipudeviwapi/aDVgexb/19562491403.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450046/normal_5ff8b614a5900.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467318/normal_5feb5167933ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417806/normal_5fdc62a37f29f.pdfIn PDF document text
    • http://datekal.22web.org/types_of_verbs_worksheet_with_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/xakelafu/gihhbjg/innawoods_game_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420587/normal_5fce4f214b54a.pdfIn PDF document text
    • https://ziziwatir.weebly.com/uploads/1/3/4/7/134713039/sudefufojogubamaner.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvomuvugu/pgjgfij/mt_bethel_pa_hotels.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/vavapekadoliti/google_maps_audio_not_working_android.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/almost_there_disney_sheet_music.pdfIn PDF document text
    • http://sujemitusosida.epizy.com/palo_alto_3020_datasheet.pdfIn PDF document text
    • http://bomajada.epizy.com/bsc_math_mechanics_book.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/47477944243.pdfIn PDF document text
    • http://vorinemoxolupip.rf.gd/cashflow_quadrant_book.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawe/12101513111.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_off0000f7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CB 5208 bytes
SHA-256: 8b366c055b6a127504099e03e3cbd649da9a4425cda7e2a50d7b0a8dbadf1782
font_01_sfnt_off00010983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10983 10576 bytes
SHA-256: 8fb1e95b239dd209e6adb33f3b95493185ed99d402534d3a6d9e7fe2e07db13f

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