Malicious PDF — malware analysis report

Static analysis result for SHA-256 27d283c09eb2c19e…

MALICIOUS

PDF

72.5 KB Created: 2021-05-18 17:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: afa566e0a38681ea615a384ec4f43d90 SHA-1: 97ebdf1c307877cf84c2629c46c63669348f0572 SHA-256: 27d283c09eb2c19e55543830651599bf6aed726f42f87291c82a27e8a035036e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm designed to direct users to potentially malicious content. The primary URL, 'https://soxebez.ru/strik?utm_term=macho+mp3+song+download+masstamilan', appears to be a lure for downloading media, which is a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://soxebez.ru/strik?utm_term=macho+mp3+song+download+masstamilan PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421969/normal_604d2b63a0235.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411250/normal_5fc93848b5cfb.pdfIn PDF document text
    • https://kokilanoru.weebly.com/uploads/1/3/4/0/134012510/rolinijoj_gefanuxepefu.pdfIn PDF document text
    • https://derewoju.weebly.com/uploads/1/3/4/3/134319287/tekejaraselizexet.pdfIn PDF document text
    • https://tekemuwuva.weebly.com/uploads/1/3/0/7/130775778/7331977.pdfIn PDF document text
    • https://bizitaninajoki.weebly.com/uploads/1/3/5/3/135316521/pesuxos_fedabojigumeg_xupugalonigun_zawizulosezogim.pdfIn PDF document text
    • https://pigokujedaxe.weebly.com/uploads/1/3/0/7/130740563/vaxugibobiwisewiva.pdfIn PDF document text
    • https://sufotope.weebly.com/uploads/1/3/0/7/130775917/9793ee7.pdfIn PDF document text
    • https://biwizodem.weebly.com/uploads/1/3/4/6/134650183/3627390.pdfIn PDF document text
    • https://bosuzegenelulu.weebly.com/uploads/1/3/4/1/134131522/disuxew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423136/normal_5fe0210b98b3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415331/normal_5fd6f4954e7cd.pdfIn PDF document text
    • https://gekubele.weebly.com/uploads/1/3/2/6/132683169/bdf838.pdfIn PDF document text
    • https://gebedevalofibut.weebly.com/uploads/1/3/4/3/134379687/jifasiw.pdfIn PDF document text
    • http://joxoganatiwo.iblogger.org/in_another_country_movie_watch_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xugeseza.epizy.com/59510380110.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_off0000dd32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD32 5652 bytes
SHA-256: dea1fcfc74aa9e43c5eb512b48065a178fe88d6b09dbf5562799f9ad9c7ae664
font_01_sfnt_off0000f064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF064 10744 bytes
SHA-256: a0d216c28906badb96feeee677e3639af24d24629f6f612e7959514f014c8da8

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