Malicious PDF — malware analysis report

Static analysis result for SHA-256 eff8dfbbb0358717…

MALICIOUS

PDF

75.4 KB Created: 2021-05-30 21:29:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 6996e36a0b1c49fa4f21d9781303bf1c SHA-1: cf1afb3c3456fab3416d441bb2ab88c668de247a SHA-256: eff8dfbbb0358717108a682df91948fbecc40363a8630df03c3fb1887add5318
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by an ML classifier. It contains a large number of external links, many pointing to disposable domains and Weebly-hosted PDFs, indicating a link farm likely used for SEO manipulation or to distribute further malicious content. The presence of embedded URLs and the PDF structure strongly suggest an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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://maypoin.ru/123?utm_term=dj+and+remix+songs+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451352/normal_604faf825f57f.pdfIn PDF document text
    • https://putebofodabisig.weebly.com/uploads/1/3/4/3/134368176/xepibamuti.pdfIn PDF document text
    • https://vewewiganivobob.weebly.com/uploads/1/3/4/8/134852084/bd994e8c.pdfIn PDF document text
    • https://gadetuzajuvi.weebly.com/uploads/1/3/4/8/134850054/modufutatatujobug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403117/normal_6011984bd88fb.pdfIn PDF document text
    • https://daliroxemonove.weebly.com/uploads/1/3/0/7/130775241/7844142.pdfIn PDF document text
    • https://xidiziwuzubiwon.weebly.com/uploads/1/3/4/6/134653180/04760c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476783/normal_5ff94a16d4f8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455185/normal_606a19c977585.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373749/normal_604f2efcdbc8e.pdfIn PDF document text
    • https://migamusuzugu.weebly.com/uploads/1/3/4/6/134657386/buregixefis_busada_tolilati_vowovubeniwu.pdfIn PDF document text
    • https://morozosewiveloz.weebly.com/uploads/1/3/4/3/134387595/9981191.pdfIn PDF document text
    • https://bexubumid.weebly.com/uploads/1/3/4/0/134040754/kuvufufot.pdfIn PDF document text
    • https://wububored.weebly.com/uploads/1/3/4/0/134042895/nevonutado.pdfIn PDF document text
    • https://duzaguzu.weebly.com/uploads/1/3/1/4/131406181/7292484.pdfIn PDF document text
    • https://gifoxulexup.weebly.com/uploads/1/3/4/8/134865115/6921631.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388282/normal_5fec9a765e93f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495037/normal_5ffa80f408283.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366956/normal_5fd7c18c487b7.pdfIn PDF document text
    • https://xawimoveparuz.weebly.com/uploads/1/3/4/0/134040397/996868003b35e.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/d6859b9e-cc1e-4cea-83a8-d81722442fba/how_long_will_a_100lb_propane_tank_last_on_a_30000_btu_heater.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73cd8dc4-3644-4b6e-878f-c0e82f3fc7c9/gujanerexikipef.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_off0000e9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AE 5336 bytes
SHA-256: 3f1b738fd116d03e60d87de622dc315ddce2275db69142ab08c3f11706140709
font_01_sfnt_off0000fbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD2 10860 bytes
SHA-256: c7902be56507c3a97803a966de8063e6e4780e427bc07c6c70ce19dbc3f5087e

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