Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ffc090f97387cb…

MALICIOUS

PDF

70.3 KB Created: 2021-03-23 11:43:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 755c8ed4904725b2a0ee7fd32bb8ba74 SHA-1: 5d466edf525a228be97741350ae2196ac7a96e51 SHA-256: b8ffc090f97387cb5d5ae40cf6a2d5dd07706d1d50881897e13ec21a08555574
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dugedepap.ru/strik?utm_term=asus+z170+deluxe+reset+bios PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4401982/normal_5fe2b7a24778f.pdfIn PDF document text
    • http://zezasarasojid.mywebcommunity.org/70515599810.pdfIn PDF document text
    • http://uablog.website/foldable_picnic_table_with_umbrellatzjmg.pdfIn PDF document text
    • http://lnstagramcopyrightmanagement.com/38895323110f1j15.pdfIn PDF document text
    • http://wapadax.scienceontheweb.net/hunger_games_mockingjay_part_2_full_movie_download_filmywap.pdfIn PDF document text
    • http://pufisiluvapugif.22web.org/xekebexakaba.pdfIn PDF document text
    • http://zatutajijiti.getenjoyment.net/69420054748.pdfIn PDF document text
    • http://gitodejigo.iblogger.org/apprendre_le_russe_alphabet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494668/normal_6034394adc51b.pdfIn PDF document text
    • http://shoop-fk.ru/gojusesimajezoe1d40.pdfIn PDF document text
    • http://lirifajo.sportsontheweb.net/xemigigigugexesi.pdfIn PDF document text
    • http://hookup754.fun/como_influyen_los_medios_de_comunicacion_en_la_vida_del_ser_humano853zb.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/zuxime/abviewer_full_version.pdfIn PDF document text
    • http://mejizanukak.rf.gd/jajabovidixo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d49aef1b-ff18-4093-b479-9c205d20088b/new_yorker_cover_april_13_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d54377b2-9471-4734-b543-129c4212e5fd/stand_by_me_ben_e_king_song_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cbba970-f9f3-4564-997d-9a909528828d/19670640898.pdfIn PDF document text
    • http://romofimor.onlinewebshop.net/how_to_reset_jabra_headset.pdfIn PDF document text
    • http://wemojeduxikuzem.rf.gd/gegusojopafijavita.pdfIn PDF document text
    • https://s3.amazonaws.com/gonasidupij/61335086517.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_off0000d7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D6 5132 bytes
SHA-256: 4bd4a347825945510e1c61b42cc9b08c8cab9a670150a8d8b0026855123daf6c
font_01_sfnt_off0000e96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96B 10244 bytes
SHA-256: db674d16249edb97c8f264112298ce6c8548b0f76ade2da9adc34ec661d57f42

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