Malicious PDF — malware analysis report

Static analysis result for SHA-256 75dd27d09d3d5cff…

MALICIOUS

PDF

81.7 KB Created: 2021-02-15 05:39:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5b237ec29fbed224f075d702dd098f68 SHA-1: d6b51d7372b383d59d1bcb45d22915598db0c2f8 SHA-256: 75dd27d09d3d5cff1ef2ccc84f6bdbd7da70fb3f5020ea70600f53907645c105
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one pointing to 'jacksth.ru' which is flagged as a potential lure. ClamAV detection and ML classification strongly indicate maliciousness. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm designed to distribute malicious content, likely through the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://jacksth.ru/wb?keyword=qualities%20of%20good%20research%20report%20ppt PDF link annotation
    • https://rozenawaxu.weebly.com/uploads/1/3/4/5/134517597/5a5ce6.pdfIn PDF document text
    • http://xewosaxebojufir.iblogger.org/76007486235.pdfIn PDF document text
    • http://manirixibuwoko.iblogger.org/79327206465.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458161/normal_5fd661e4e5e2d.pdfIn PDF document text
    • http://idealslim-italiaoficial.site/95799462761zfae.pdfIn PDF document text
    • https://zotizoju.weebly.com/uploads/1/3/5/3/135349435/vesuvusutabofa_nukamidelos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dowewuzosibu.epizy.com/nukinabofusuz.pdfIn PDF document text
    • http://nerokezixuzat.epizy.com/kujoden.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/zutot.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/nonewuretokuvivin.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/48503029587.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/zitudijiwozuk.pdfIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/appvalley_ios_9._3._5.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/97085772530.pdfIn PDF document text
    • http://xovafufu.rf.gd/xijekagexux.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_off0001033f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033F 5480 bytes
SHA-256: e025fe63aa0cc041fbc81f5dfc1bac7de4dbb153e7ceb01ea77806ddc2bbe5fb
font_01_sfnt_off000115dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DC 10544 bytes
SHA-256: 1931bb221c757b534effc6b19fd842e648cc022844dacdd2b6cef88ff730de29

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