Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d375c36e39ed7e9…

MALICIOUS

PDF

74.8 KB Created: 2021-03-19 05:19:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1190f751e0670ebfdc5286ee323d0ef4 SHA-1: d37cbf2d29d4cacaf93b667f78779e9be0e12310 SHA-256: 1d375c36e39ed7e9420ee91b970338bb97260f5dbcddf719e1cd47638e716714
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://jacksth.ru/strik?utm_term=traditional+wing+chun+-+wooden+dummy+training+pdf PDF link annotation
    • http://gikonifip.22web.org/ritez.pdfIn PDF document text
    • https://polopomix.weebly.com/uploads/1/3/4/8/134849819/ramaxuzuxogop_gorutakusaz.pdfIn PDF document text
    • https://senokolar.weebly.com/uploads/1/3/4/6/134628648/xubupoxonegevi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410415/normal_5fcf5b055f55c.pdfIn PDF document text
    • https://tivelagazevuw.weebly.com/uploads/1/3/4/1/134131505/wirofin.pdfIn PDF document text
    • https://kukutapiroboj.weebly.com/uploads/1/3/4/7/134712573/xunuvilin_waweneb.pdfIn PDF document text
    • https://xikalevu.weebly.com/uploads/1/3/4/3/134319979/c5697d9f23cf28a.pdfIn PDF document text
    • https://lokudepapina.weebly.com/uploads/1/3/5/3/135325929/1956174.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408707/normal_602ef0e150534.pdfIn PDF document text
    • http://woravijida.22web.org/sinova.pdfIn PDF document text
    • http://kifavofo.22web.org/binesuvupote.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460690/normal_6030304f8f9f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383565/normal_6020d521cabc9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/97a5cf84-91e3-4c3f-80d9-5995996d4487/how_to_prepare_for_an_amazon_warehouse_interview.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fd2708a-a9ec-4d24-9dfd-37525d5b08f6/xotasonasilugenaza.pdfIn PDF document text
    • http://koburolamugalo.rf.gd/afficher_texte_apres_formule_excel.pdfIn PDF document text
    • http://vivusefodubelep.epizy.com/41861235070.pdfIn PDF document text
    • http://pulepuvasa.rf.gd/harry_potter_und_der_stein_der_weisen_ganzer_film_deutsch.pdfIn PDF document text
    • http://nowaginog.epizy.com/55686940800.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_off0000e4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B9 5564 bytes
SHA-256: 7f862ed0c84703e7cadab9b8788cc5148226a9e0cc32c1ff156a74f659422321
font_01_sfnt_off0000f79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79D 10692 bytes
SHA-256: 134239c72b4d1a4faa6ca2639f19dcd0da107bea6b79a33b29c85e53abfad8bc

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