Malicious PDF — malware analysis report

Static analysis result for SHA-256 a325248fa928b663…

MALICIOUS

PDF

81.0 KB Created: 2021-02-10 16:32:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a48267a53484e1f2cadfcbbe3fad589d SHA-1: 20302c855bcd67f94b65e4da9c9416fa624484cf SHA-256: a325248fa928b6633040dc58f427102cfdab86c11d261a6c6c41911a5209ce1e
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection to malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence indicate malicious intent. The document body appears to be malformed or encrypted, preventing a deeper analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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/123?utm_term=fondo+monetario+internacional+presidente PDF link annotation
    • http://fitokapss.xyz/ge_x400_blinking_red_lightolvo3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385012/normal_5fd07a099d042.pdfIn PDF document text
    • https://cdn.sqhk.co/xaranoraf/jblwhds/milevesisawarikuda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392660/normal_600c432e024af.pdfIn PDF document text
    • https://sujujiga.weebly.com/uploads/1/3/1/3/131379538/457667.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392441/normal_6006710e5005a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493876/normal_6007fceb6dabc.pdfIn PDF document text
    • https://cdn.sqhk.co/fekawifen/ZjaEjfS/97540298065.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380700/normal_601bda20dc592.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448542/normal_6011ed4d3f1d6.pdfIn PDF document text
    • https://cdn.sqhk.co/velabolo/hhihkjd/56682260699.pdfIn PDF document text
    • https://niguzagum.weebly.com/uploads/1/3/5/3/135390192/kapiduduwi_natuvolufijog_mejemuro.pdfIn PDF document text
    • https://cdn.sqhk.co/gituxogud/dGGohiB/20295017271.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425491/normal_5ff9f2351ebf8.pdfIn PDF document text
    • http://biomaniix.website/fokusoxemowuwobutasidari2kha1.pdfIn PDF document text
    • https://cdn.sqhk.co/topazawu/ahfjajd/photo_lab_picture_editor_fx_pro_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC61 4964 bytes
SHA-256: ac4fd290aa30187a51b4921daa4ee3e02c95293b7346993d53a37524126c915f
font_01_sfnt_off0000fd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1C 13304 bytes
SHA-256: b4b43fee099428be5a8c33eb627a4137a7685ce079f16fd6e344141b5f926697
font_02_sfnt_off000126d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D8 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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