Malicious PDF — malware analysis report

Static analysis result for SHA-256 22db489deb6652a0…

MALICIOUS

PDF

70.2 KB Created: 2021-03-18 18:31:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11c8dcc7b4f642f8f32c66dbf4e680e1 SHA-1: 92b186e153d30b6f9d8ca58112d053a066d411d3 SHA-256: 22db489deb6652a082c490a953aa6d9da428b40bb3e7dd2305b8f65a0d8579f2
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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 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://resalured.ru/wix?keyword=therians+garage+webster+ma
    • https://lewanodeb.weebly.com/uploads/1/3/4/8/134885095/lurivivapa.pdf
    • https://vigusukababimer.weebly.com/uploads/1/3/4/8/134881512/4974617.pdf
    • https://lawanirixuxevu.weebly.com/uploads/1/3/4/4/134444287/e6c13d2896bd.pdf
    • https://cdn.sqhk.co/volumusigu/IK4wAjb/christmas_party_invitation_card_template.pdf
    • https://vanimiravupu.weebly.com/uploads/1/3/2/7/132710567/gadud.pdf
    • https://bilewemebit.weebly.com/uploads/1/3/5/9/135964156/sogoguponujarubone.pdf
    • https://cdn.sqhk.co/rojisixel/ZmoQuhe/21071217938.pdf
    • https://fuvapevamasazu.weebly.com/uploads/1/3/4/5/134507747/sivodajijinu-mixudeva-towazuzuze.pdf
    • https://cdn.sqhk.co/parabeset/iGYhjhd/pekixavadivuva.pdf
    • http://nipokaxa.getenjoyment.net/the_main_sources_of_atmospheric_carbon_dioxide.pdf
    • http://kitafoged.medianewsonline.com/71813851150.pdf
    • https://wosepujejos.weebly.com/uploads/1/3/4/6/134649517/nugusovepesunamifi.pdf
    • https://cdn.sqhk.co/zidadipam/ifgfvje/absurd_theatre.pdf
    • https://popupobapovuzus.weebly.com/uploads/1/3/4/0/134012290/5d098885b1.pdf
    • https://cdn.sqhk.co/juxajomuz/wnagegj/39900090105.pdf
    • https://supifafal.weebly.com/uploads/1/3/5/9/135968022/1854243.pdf
    • https://gudesikoz.weebly.com/uploads/1/3/4/3/134374550/vebonobejaridi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/laradusa/27759896123.pdf
    • https://89d37d93-eaf9-4fc7-8d5e-07438b8f18e7.filesusr.com/ugd/e80f4c_de241d9ad96748618ef692e756dd5b7f.pdf?index=true
    • http://duvodix.myartsonline.com/how_to_charge_timex_solar_watch.pdf
    • https://b1d4f555-1eac-4d61-aa83-27206cf3ee4b.filesusr.com/ugd/1706f5_c4c9a04ec0064b019490e8f1824fb930.pdf?index=true
    • https://s3.amazonaws.com/fatikonavori/how_to_learn_muay_thai_at_home.pdf
    • http://jubogaju.atwebpages.com/wasazonaput.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d381.bin
fe1c0484352f7bc13c689252c885201984c580bfe2e80a23e10e28ae976ab70c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD381 5248 bytes
font_01_sfnt_off0000e543.bin
e7835ce364fcdb07e59a22364e7681e885cf6be6af51dd4443daf8b0995b0d4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE543 10968 bytes

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