Malicious PDF — malware analysis report

Static analysis result for SHA-256 2088a05a3e1e4362…

MALICIOUS

PDF

77.1 KB Created: 2021-06-01 02:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e583c1e7872dda909ee70a6492ef53c1 SHA-1: 2663b7279221deea3deadf0020f7c27abc74806e SHA-256: 2088a05a3e1e43624eaec6a2760c184379499f9f20c591d1d6b871da686409c5
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to direct users to potentially malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://archism.ru/pbw?utm_term=how+do+i+set+a+time+limit+on+my+samsung+tablet PDF link annotation
    • https://vukijimox.weebly.com/uploads/1/3/4/3/134358494/mubenupejigaxo.pdfIn PDF document text
    • https://buxutagugumazas.weebly.com/uploads/1/3/4/0/134095839/xegomoluwodubuxuweva.pdfIn PDF document text
    • https://wetagazikizofab.weebly.com/uploads/1/3/4/5/134590768/niruwedireteziv_dukibasi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417039/normal_5fee617ac0efd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446773/normal_60263497704e1.pdfIn PDF document text
    • https://zufitamel.weebly.com/uploads/1/3/5/3/135349526/669b9b.pdfIn PDF document text
    • https://xonidaxu.weebly.com/uploads/1/3/4/3/134319292/durezi.pdfIn PDF document text
    • https://xinemituvirow.weebly.com/uploads/1/3/4/1/134108685/wisipobuluk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374963/normal_6054dce2ed91d.pdfIn PDF document text
    • https://reborugavuzak.weebly.com/uploads/1/3/4/7/134736286/0332ba5e4bf5.pdfIn PDF document text
    • https://kibutabez.weebly.com/uploads/1/3/4/4/134438896/zivijetapixa.pdfIn PDF document text
    • https://rakositove.weebly.com/uploads/1/3/4/5/134595637/46c8c466e62279.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369631/normal_5ff07a6a2d262.pdfIn PDF document text
    • https://limogugopowara.weebly.com/uploads/1/3/1/6/131637055/zirov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384628/normal_6038714464525.pdfIn PDF document text
    • https://sipopomek.weebly.com/uploads/1/3/4/6/134632846/bofugovo-vonixoju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xalomuzavege.pbworks.com/f/can_cats_get_moles_or_skin_tags.pdfIn PDF document text
    • http://buvavipoluvu.pbworks.com/w/file/fetch/144424446/41790920659.pdfIn PDF document text
    • http://degenazi.pbworks.com/w/file/fetch/144431610/88919338521.pdfIn PDF document text
    • http://wekibivu.pbworks.com/f/ac_market_mod_apk_2020_download.pdfIn PDF document text
    • http://pezeliv.pbworks.com/f/mckenzie_technique_for_herniated_disc.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/w/file/fetch/144418446/voxukufosegalaluzogitowet.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_off0000eee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE6 5344 bytes
SHA-256: db6a6519da180e1dcf4a321b71bc99699a25b3ece40e9e28e49d192756a3d6d6
font_01_sfnt_off0001011d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011D 11092 bytes
SHA-256: 2243f1b8f56faeefc1849663deb8589cf5bc755d5b7d2f0671ebc5f4cdae6f39