Malicious PDF — malware analysis report

Static analysis result for SHA-256 223738f38cbe54ab…

MALICIOUS

PDF

80.4 KB Created: 2021-03-08 23:03:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 917589c9170dee0ceb062f4422668812 SHA-1: 5d218f0fbb721f396bc8f3dbb826ae937ac8af40 SHA-256: 223738f38cbe54ab73111477bf5b1cb4b92e4a4d0ff0fab1effccc73949fc463
186 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a PDF link farm. It contains numerous external URIs, many pointing to disposable hosting, suggesting an attempt to manipulate search engine results or distribute content. The presence of embedded URLs and the overall structure strongly indicate a malicious intent, likely related to phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/aws?utm_term=what+was+job+in+the+bible PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366627/normal_603a89b56c627.pdfIn PDF document text
    • https://wepebajaka.weebly.com/uploads/1/3/4/5/134588919/9617592.pdfIn PDF document text
    • https://sewowifef.weebly.com/uploads/1/3/6/0/136082850/d54674a81.pdfIn PDF document text
    • https://cdn.sqhk.co/rufopunuk/aFjclji/695723912.pdfIn PDF document text
    • https://cdn.sqhk.co/tovasodoj/idjiKjd/34985928031.pdfIn PDF document text
    • https://karesaxu.weebly.com/uploads/1/3/5/3/135392924/7834e5c82c.pdfIn PDF document text
    • https://cdn.sqhk.co/riwaxagi/u7vhh83/cuba_travel_advisory_covid-_19.pdfIn PDF document text
    • https://mavakonagidesa.weebly.com/uploads/1/3/1/4/131483278/216c08b5b94.pdfIn PDF document text
    • https://cdn.sqhk.co/vomisape/abhjhcG/80457438616.pdfIn PDF document text
    • https://pakunifa.weebly.com/uploads/1/3/5/3/135307874/827a28d6cea155.pdfIn PDF document text
    • https://cdn.sqhk.co/jisujesox/arygc27/28998121961.pdfIn PDF document text
    • https://vaxulisexo.weebly.com/uploads/1/3/4/6/134600260/wiwoxibopo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383798/normal_603107a6b55b2.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/pafiganovavi/17675604358.pdfIn PDF document text
    • http://vujapoguxesak.myartsonline.com/how_to_get_your_pa_real_estate_license.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/56146152403.pdfIn PDF document text
    • http://zudupaxub.myartsonline.com/what_is_the_implication_of_ethics_in_health_and_physical_education.pdfIn PDF document text
    • http://pefimubis.myartsonline.com/xatetosifetilamixijafi.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/endless_alleluia_piano.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/what_do_you_call_a_female_warrior.pdfIn PDF document text
    • https://s3.amazonaws.com/siwixomudit/warodetotudipozufoma.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_off0000fe17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE17 4996 bytes
SHA-256: 4d7b15abb0571740dce61851c5c3692aa5be8f6ac41dd969caf6617347e29bf7
font_01_sfnt_off00010f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2D 10804 bytes
SHA-256: 42a7da6345513bca32404bdccdf709417c2a3ca041c254a26b16ab714c5c869a

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