Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc8ad8e59cd8786…

MALICIOUS

PDF

70.6 KB Created: 2021-02-17 03:51:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 97f303304e421c3b21d7b2818f628781 SHA-1: 803b9d7570e1c8d703e244c61700061d71f15c0e SHA-256: 5fc8ad8e59cd87869f4bde33427621e5de8940def2f08d6b7e84fcaeaedfca51
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

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://jacksth.ru/123?utm_term=baofeng+uv-5re+vs+baofeng+uv-5ra PDF link annotation
    • https://takokapaxuv.weebly.com/uploads/1/3/0/9/130968961/0dac9c32d95.pdfIn PDF document text
    • http://italia-doc.fun/anglican_breviaryebyfl.pdfIn PDF document text
    • http://ccckkkkk.space/ark_dodo_wyvern_spawn_idnfd1r.pdfIn PDF document text
    • http://izzzaaa.space/defuse_the_bomb_bungee_rugby_ballys72h.pdfIn PDF document text
    • http://obsluzhivanie-kompyuterov.moscow/12885825125vkfsc.pdfIn PDF document text
    • https://muwalivom.weebly.com/uploads/1/3/2/6/132695892/kasiruf-pewol-losegimup.pdfIn PDF document text
    • https://zofazozudu.weebly.com/uploads/1/3/0/7/130739697/fezalukezasar.pdfIn PDF document text
    • https://zokanebawabor.weebly.com/uploads/1/3/1/4/131438448/bavez-lulunixo-pulobep-kujesefodawa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501775/normal_600c165b8dd48.pdfIn PDF document text
    • https://tolubezilonis.weebly.com/uploads/1/3/5/3/135348590/ligemetibowo_razopepitujef.pdfIn PDF document text
    • https://tanofome.weebly.com/uploads/1/3/5/3/135316841/5104741.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368756/normal_5feb978cd6371.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/ximupuv/wowakidexotepekefizusa.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/english_songs_online_play_and.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/caesarean_section.pdfIn PDF document text
    • https://s3.amazonaws.com/murudute/8577933988.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_off0000d533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD533 5308 bytes
SHA-256: 45dfba1ce5154532bbf5bdecb201f37894b9833105c5e9e4d91c05180b71d949
font_01_sfnt_off0000e76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76E 11068 bytes
SHA-256: 918ddcea5d1d92f91550c0ed5439fd3a31a395da284b489ba53a043951e5d605

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