Malicious PDF — malware analysis report

Static analysis result for SHA-256 526d1be7f1cc7e42…

MALICIOUS

PDF

65.8 KB Created: 2020-11-23 17:00:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0125e10e3b9080bdcf82a5e08a5d99bb SHA-1: 190eaf5d6154870b8de24d50d1ba7ec80c3451a6 SHA-256: 526d1be7f1cc7e420385e371bf0f20c08035c6ffab59683a79a9dc2e9923118e
252 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to disposable hosting services and redirector infrastructure. The primary link leads to a known malicious redirector, suggesting the document is part of a link-farming or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffking.ru/strik?utm_term=farming+simulator+2014+indir In PDF document text
    • https://galezarulunozip.weebly.com/uploads/1/3/4/8/134896955/5455540.pdfIn PDF document text
    • https://poperetaro.weebly.com/uploads/1/3/4/8/134893078/1db6abae.pdfIn PDF document text
    • https://nagorulanol.weebly.com/uploads/1/3/4/4/134465391/3496513.pdfIn PDF document text
    • https://gemamiji.weebly.com/uploads/1/3/4/3/134372226/xaretavolaja.pdfIn PDF document text
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/gipij.pdfIn PDF document text
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/7702792.pdfIn PDF document text
    • https://pefodiral.weebly.com/uploads/1/3/4/4/134476409/menonalobidexapip.pdfIn PDF document text
    • https://misopiwulasi.weebly.com/uploads/1/3/1/8/131856666/suwakobadet.pdfIn PDF document text
    • https://xoretesani.weebly.com/uploads/1/3/4/3/134315313/kefemofikeraxupejipu.pdfIn PDF document text
    • https://xawaviwuxuj.weebly.com/uploads/1/3/4/2/134235980/4516033.pdfIn PDF document text
    • https://nibawomufexax.weebly.com/uploads/1/3/4/3/134371272/zonukokujutoriwexo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390642/normal_5f8e321259891.pdfIn PDF document text
    • https://maxifabosogup.weebly.com/uploads/1/3/4/5/134526580/gefivesiroz-batilusudi.pdfIn PDF document text
    • https://jidisozipu.weebly.com/uploads/1/3/4/4/134440811/daxuzaro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/atal_bihari_vajpayee_kavita_download.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/muxokowitub.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_off0000c238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC238 5512 bytes
SHA-256: 7c46322257a6a39f7b7a2b073187105e90d2d763e86ec72ba00140dc357b7e70
font_01_sfnt_off0000d4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E5 10864 bytes
SHA-256: 273148c99b20fb42aeef90487e6b5bfc8d5df14d73a0933f832a3a7a91289042

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