Malicious PDF — malware analysis report

Static analysis result for SHA-256 448fde714a238aed…

MALICIOUS

PDF

78.2 KB Created: 2021-04-14 14:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a844daecc26a26b4c6fcbbce31c1639 SHA-1: 2e2325e9536cdabdb185834d31e71950839a75f6 SHA-256: 448fde714a238aedb7f0a248174df55dbebbe84aa2b41131bd363ac3a8a93588
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URLs, such as https://vilenefex.ru/strik?utm_term=amantes+del+se%25C3%25B1or+de+los+cielos, are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/strik?utm_term=amantes+del+se%25C3%25B1or+de+los+cielos
    • https://cdn.sqhk.co/mesodimeduje/jahsrjj/membership_confirmation_email_template.pdf
    • https://cdn.sqhk.co/tefozakozup/egdjgic/53363328239.pdf
    • https://kadiserujutame.weebly.com/uploads/1/3/5/3/135391940/kobud_bivugubiw.pdf
    • https://suwutijotelites.weebly.com/uploads/1/3/6/0/136083726/3099893.pdf
    • https://fimiximokizo.weebly.com/uploads/1/3/1/3/131384127/zowudizikekesafexupo.pdf
    • https://mifavawuzizadax.weebly.com/uploads/1/3/5/9/135977912/6140376.pdf
    • http://runojiwum.getenjoyment.net/arsene_lupin_contre_sherlock_holmes.pdf
    • https://fuxugikitoze.weebly.com/uploads/1/3/1/0/131070560/tibetom.pdf
    • https://vusuranozaxo.weebly.com/uploads/1/3/4/0/134012668/jagupotidatu-gavipov.pdf
    • http://linefofaxugedu.mywebcommunity.org/college_panda_writing.pdf
    • https://cdn.sqhk.co/zotofoza/g61jjhf/airplane_movie_meme_generator.pdf
    • http://jedusajinud.mygamesonline.org/punarabowikomovaka.pdf
    • https://cdn.sqhk.co/vasinabew/6hehbSh/zavofimor.pdf
    • https://cdn.sqhk.co/nunepokuwe/gizggsD/bifavojawepuwibunoxaluxi.pdf
    • https://xalemewo.weebly.com/uploads/1/3/4/6/134665704/xojukaritij_sibumer_tudomeval_lifuvobuwuw.pdf
    • http://nageramuvepom.mywebcommunity.org/what_fluid_do_i_use_in_my_allison_transmission.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/ganubatebedoxez/loriwovepimav.pdf
    • https://s3.amazonaws.com/vexeliku/braun_drip_filter_coffee_machine.pdf
    • https://a146b927-ed54-472d-b3a8-6b137e313b92.filesusr.com/ugd/4d400c_980b870103084c4fb37e7799ec284332.pdf?index=true
    • http://jokubamobivavum.onlinewebshop.net/araku_valley_travel_guide.pdf
    • https://cd70d4e5-4a1a-4071-96d1-f2415ea5ece1.filesusr.com/ugd/7f46b5_ccf6e4f2cf5f4d44acc37ef8d10ceb86.pdf?index=true
    • https://s3.amazonaws.com/toguvaju/the_smog_of_the_sea.pdf
    • https://s3.amazonaws.com/fekazudabo/kenwood_kdc-bt362u_manual.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_off0000f368.bin
2f0e33b9040a7627c63e0942cdff27c6d563bfdb7e5b875e8fda9758a847e848		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF368 5288 bytes
font_01_sfnt_off00010503.bin
db1a21741586623175fb2ed288d58c6bed3a6c649f8d17a78e007f5a5739a021		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10503 11224 bytes

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