Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa43475cf104dd5d…

MALICIOUS

PDF

71.6 KB Created: 2021-06-09 18:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b93407c39a3cc3d9e11eff5f86354e2c SHA-1: 694928846d6c7eaedc9c117f1adf321e3db63bd0 SHA-256: fa43475cf104dd5df323af62ed47172aeea371aeb79f0157887a80915a4f4b15
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or phishing operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://chcial.ru/pbw?utm_term=abdullah+novel+part+3+online+reading PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382779/normal_5fd3baab7d6c2.pdfIn PDF document text
    • https://zuxidonav.weebly.com/uploads/1/3/4/8/134867872/fidolukadunokiw_daxavew.pdfIn PDF document text
    • https://nuvuxupu.weebly.com/uploads/1/3/4/5/134507381/2ba3022007a466b.pdfIn PDF document text
    • https://xinefozi.weebly.com/uploads/1/3/0/7/130775465/moxetiruxawofud.pdfIn PDF document text
    • https://xizikako.weebly.com/uploads/1/3/0/9/130969027/kozukanub.pdfIn PDF document text
    • https://suziviwibemenaf.weebly.com/uploads/1/3/4/4/134485417/zasoxokujajinabo.pdfIn PDF document text
    • https://bewuzitavunu.weebly.com/uploads/1/3/4/3/134349104/bazuwesoza.pdfIn PDF document text
    • https://ginubeputugexow.weebly.com/uploads/1/3/0/7/130738710/2433988.pdfIn PDF document text
    • https://ravaruxotono.weebly.com/uploads/1/3/6/0/136087447/doratamuzesu_wodatugatok.pdfIn PDF document text
    • https://rizomoxus.weebly.com/uploads/1/3/4/5/134589692/8b5706.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460982/normal_5fff4a7ba596f.pdfIn PDF document text
    • https://nelubetif.weebly.com/uploads/1/3/5/3/135322580/wubezutedap-xizukur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393751/normal_5fe6ee3b0e31d.pdfIn PDF document text
    • https://dolopexoje.weebly.com/uploads/1/3/1/8/131872138/refam_bamap.pdfIn PDF document text
    • https://vuvararuwojagis.weebly.com/uploads/1/3/4/6/134608035/seruliduri-lodibukavumog-xinimajewasiweb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469126/normal_604304d2ae50e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425737/normal_5fd2250a75842.pdfIn PDF document text
    • https://modatubegawaso.weebly.com/uploads/1/3/4/4/134491319/8108578.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://taxoxuf.pbworks.com/w/file/fetch/144828540/war_hollywood_full_movie_download_in_hindi_filmyzilla.pdfIn PDF document text
    • http://motewutoma.pbworks.com/w/file/fetch/144835509/7-8.pdfIn PDF document text
    • http://dajodovilav.pbworks.com/w/file/fetch/144534294/86145248637.pdfIn PDF document text
    • http://xotokuwawa.pbworks.com/w/file/fetch/144775278/nobodut_hsc_english_test_paper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/793a00a3-1fa9-43b5-9e70-e3744f26a540/lepokuzewojutijigusogiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd16a111-13ab-4d89-80dd-aa208521109b/54315876166.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_off0000d6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E2 5396 bytes
SHA-256: 81c2d9a44674579975a51898083ed340b3948483a0c7219acb5f7c0328dc0701
font_01_sfnt_off0000e937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE937 12140 bytes
SHA-256: d32ab93f07b4d3df0fb47ac808be46803a13e75556917fe68d8c3b8f094df993