Malicious PDF — malware analysis report

Static analysis result for SHA-256 b057de5d64e8d0d7…

MALICIOUS

PDF

74.1 KB Created: 2021-03-10 15:12:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 29d7e81e670956763264c31481230bc9 SHA-1: dea1a0bcb6eaf82375180a03229913f0ef641fdb SHA-256: b057de5d64e8d0d7bbf77e00e3bbe1eaad1a784e86b2962c3d0e06867c92dd1d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs pointing to various domains, many of which are hosted on disposable or dynamic DNS services. The primary purpose appears to be directing users to potentially malicious or phishing content through these links, rather than delivering a direct exploit within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jumiwimov.ru/123?utm_term=gelatine+sheets+to+powder PDF link annotation
    • http://xitodefigatefuj.medianewsonline.com/kuwizopikelojatu.pdfIn PDF document text
    • https://vozidetuvotivex.weebly.com/uploads/1/3/6/0/136094215/jujalitojizi.pdfIn PDF document text
    • http://mapoporikamo.22web.org/zefigaponuzoroli.pdfIn PDF document text
    • https://zawasofolebu.weebly.com/uploads/1/3/4/9/134902788/edb22d.pdfIn PDF document text
    • https://sosijujanakuf.weebly.com/uploads/1/3/5/3/135387992/8305530.pdfIn PDF document text
    • http://zedukibawubige.22web.org/9605021661.pdfIn PDF document text
    • http://wapazezaduv.iblogger.org/easy_clarinet_sheet_music_with_notes.pdfIn PDF document text
    • http://fiwisud.getenjoyment.net/big_little_lies_season_2_episode_5_review.pdfIn PDF document text
    • http://kakorixow.mygamesonline.org/what_is_the_ulysses_poem_about.pdfIn PDF document text
    • https://wurilulisewanid.weebly.com/uploads/1/3/4/7/134728532/34899.pdfIn PDF document text
    • https://jewupoma.weebly.com/uploads/1/3/1/4/131437657/vekes.pdfIn PDF document text
    • https://lumirofelefepo.weebly.com/uploads/1/3/4/8/134892557/5626756.pdfIn PDF document text
    • https://saxarewuvopa.weebly.com/uploads/1/3/4/8/134855039/piposepiko-xolimilirip-bixetimuwew-pisixapemokipij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xutarefes.epizy.com/al-anon_12_step_book.pdfIn PDF document text
    • http://magakawigola.epizy.com/livro_desafio_do_amor_40_dias.pdfIn PDF document text
    • http://lepugip.epizy.com/4899586126.pdfIn PDF document text
    • http://litopuputorer.rf.gd/581407912.pdfIn PDF document text
    • http://wurunuj.epizy.com/67495632902.pdfIn PDF document text
    • http://kowesodi.rf.gd/gewepigevopadid.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_off0000e31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31F 5172 bytes
SHA-256: 886498c34e177c27bb4dc07b2cc8d479061a3829b1868146c39748411ac45abb
font_01_sfnt_off0000f4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C0 11436 bytes
SHA-256: 1ca7a94ba5b67a52eff866e835c7713cf6cb6ceadefb510a5c675ae76bdbf2a3

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