Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f90287f48ace9e7…

MALICIOUS

PDF

70.8 KB Created: 2021-03-25 00:09:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4f7daf60492a42b280f1f340f71239d6 SHA-1: 52b9425c4bf62b554f45162935a8e1a01eecb22b SHA-256: 8f90287f48ace9e7fa9a7fa33b97bbf1da3d6b95e334723712bdfb903c617077
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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://jacksth.ru/strik?utm_term=swann+security+system+network+setup PDF link annotation
    • https://rifidikebipe.weebly.com/uploads/1/3/0/9/130969129/sifipujipiwef-wofobepepukura-nivameba-dunasetobuxis.pdfIn PDF document text
    • http://mizafaroremida.getenjoyment.net/27736314556.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445115/normal_6014597c0e05a.pdfIn PDF document text
    • http://peuer.xyz/mowudewanegipupubatifudegerv3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463533/normal_5fd95ed132a78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377663/normal_601e6608298ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481411/normal_5fdd5b7369778.pdfIn PDF document text
    • https://pusesame.weebly.com/uploads/1/3/4/6/134662227/binadaxoj.pdfIn PDF document text
    • http://mon-cmb.best/53626291247tej7f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a3720f92-bdaa-4449-a3ff-14f36884d2d5.filesusr.com/ugd/afadc3_b907631b245e483480c4e55b51277cc2.pdf?index=trueIn PDF document text
    • http://gegurobaz.myartsonline.com/62365950446.pdfIn PDF document text
    • http://fuvamawijivef.atwebpages.com/92065082484.pdfIn PDF document text
    • https://62abf401-5fc9-4991-ac00-cb6a0c8cf8ec.filesusr.com/ugd/e4ff69_a890543bf2f34232a12e223b13852878.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nademopor/jukipukareze.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/roxovijoru.pdfIn PDF document text
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_18f8ead4a9944d1b948e2e423e43871a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wutogugej/kenmore_microwave_model_721_parts_diagram.pdfIn PDF document text
    • http://zezofakarol.myartsonline.com/iar_embedded_workbench_tutorial.pdfIn PDF document text
    • https://6448a590-b571-4b71-a9e4-820b8531b153.filesusr.com/ugd/782be2_e14728beab7c4aa99e4fc414018b44b1.pdf?index=trueIn 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_off0000d62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62F 5408 bytes
SHA-256: fac75b40bcabbc9e8887d31f53560c2de9e5f42f4397385ace9e1e096b313b99
font_01_sfnt_off0000e898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE898 10968 bytes
SHA-256: de55901ea2225eadcaa444b9549b4f5a9b9d29b6bbb66ed6287066271a5d28d1

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