Malicious PDF — malware analysis report

Static analysis result for SHA-256 7754ba84448aaa6c…

MALICIOUS

PDF

130.0 KB Created: 2021-06-05 20:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c4ec9bb3d111ce0283fc7ff4c72cb7dc SHA-1: 850d04d9a179ca08ef1405b9942cff2f49a76303 SHA-256: 7754ba84448aaa6cc6d816acadedbf521f0c7d924d86aea7372c9207f5d24908
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. While no scripts were directly extracted, the PDF structure and embedded URLs are consistent with a phishing attack designed to redirect users to malicious sites.

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://irlanc.ru/pbw?utm_term=inteligencia+emocional+pdf+redalyc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450415/normal_5fd0d7c47e9d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420775/normal_5ff60da6144d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476140/normal_605a5c2656aae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414174/normal_6063ae335c7a4.pdfIn PDF document text
    • https://winiwezunubesu.weebly.com/uploads/1/3/1/3/131379740/kifixasujoweda-zutuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386349/normal_5fd1724e59df8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404969/normal_600064f84f3cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365586/normal_6065d7b1d9d57.pdfIn PDF document text
    • https://tumalurezap.weebly.com/uploads/1/3/2/6/132696080/tusavete.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485698/normal_601d5e9c1fb5f.pdfIn PDF document text
    • https://monivewuvafa.weebly.com/uploads/1/3/4/0/134096064/bfbc622.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379855/normal_600c56cd5ece7.pdfIn PDF document text
    • https://wosufixojiniki.weebly.com/uploads/1/3/4/7/134720754/107e07d582336f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371247/normal_60634b54e0dfa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420747/normal_5fe341a25ccb9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xovakovawup.pbworks.com/w/file/fetch/144486675/30929693145.pdfIn PDF document text
    • http://wiwedano.pbworks.com/w/file/fetch/144425343/wubamad.pdfIn PDF document text
    • http://poguvovuk.pbworks.com/f/befugezeruwuponulolum.pdfIn PDF document text
    • http://fixunomavow.pbworks.com/f/92554095152.pdfIn PDF document text
    • http://dumogaluz.pbworks.com/w/file/fetch/144575037/how_to_play_one_block_skyblock_1.16.5.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_off0001bbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BBC9 5336 bytes
SHA-256: 004502ad7cb3ca09733b2abe1dad7f6b93eb442a037f636028a2f0fbd04a420e
font_01_sfnt_off0001cdeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CDEB 13648 bytes
SHA-256: 0f9dc6286844b6435f7a97cfbb58ba96cab723ad70747dba75013eb96e2222fd