Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8515c3f2cdb3bb…

MALICIOUS

PDF

76.5 KB Created: 2021-03-13 19:08:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: e6a6c2166d2d2b6081e88afd42d4ca02 SHA-1: e872e95901e93a7304979c0e2cda9fe5fff2d8bb SHA-256: 8f8515c3f2cdb3bb9cb860cf630b98689b4c76b3130dc499113747cb775e2ed2
166 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm designed to redirect users to malicious domains. Specifically, it uses invisible links and disposable hosting to obscure the true destination, which is identified as a phishing lure. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF, likely serving as a phishing document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://pelibifir.ru/123?utm_term=manual+de+psicomagia+alejandro+jodorowsky+pdf+gratis PDF link annotation
    • http://com-login8.xyz/photo_vault_app_iphone_deletedd5je6.pdfIn PDF document text
    • http://tofugezupeb.mygamesonline.org/97414794380.pdfIn PDF document text
    • http://pokanupat.iblogger.org/antrenmanlarla_geometri_2_zmleri.pdfIn PDF document text
    • http://kawlites.online/temola23ay.pdfIn PDF document text
    • http://tegubija.mypressonline.com/49588796549.pdfIn PDF document text
    • http://tofugezupeb.mygamesonline.org/46121150834.pdfIn PDF document text
    • http://organic100.fun/varukuwumirikxoxv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://juwemijawikipo.epizy.com/game_bleach_vs_naruto_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/bottomsheetdialogfragment_fixed_height.pdfIn PDF document text
    • http://winibivazizi.rf.gd/84224216066.pdfIn PDF document text
    • http://xepuzuxomof.rf.gd/bienfaits_du_sport.pdfIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/rilojanil.pdfIn PDF document text
    • http://ligoroxenafof.atwebpages.com/kusuneni.pdfIn PDF document text
    • http://botevurisupom.rf.gd/bomoxig.pdfIn PDF document text
    • https://c3a7a64c-5591-430b-94d7-c2eadfdf3523.filesusr.com/ugd/966478_8f59eca2d816417bb7dd63fe41381950.pdf?index=trueIn PDF document text
    • http://jawevobafepen.epizy.com/sifisisogol.pdfIn PDF document text
    • http://xefavab.rf.gd/catia_v5_tutorial_surface.pdfIn PDF document text
    • https://502f924d-676a-41b3-8220-87c01882f600.filesusr.com/ugd/5a20bb_39c5d5b99f8449bfb3634e67a8bb49b8.pdf?index=trueIn PDF document text
    • https://451b78f8-089e-4d4d-bc4b-60abb621f7e6.filesusr.com/ugd/7ef0dc_5b87c2ff15114c48b03e6d4dfc6163c4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/pierre_bourdieu_biography.pdfIn PDF document text
    • http://sotenuzalarabi.epizy.com/anatomy_and_physiology_2_lab_practical_test.pdfIn PDF document text
    • http://piwiweranewu.rf.gd/begujajilevedabefudewake.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_off0000e79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79F 5816 bytes
SHA-256: 67f398a34d6f89e1de40f9544d44e36a37654935141049fd6c70d3f4a21148e3
font_01_sfnt_off0000fb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB82 12012 bytes
SHA-256: 9c9f49b4912dc68610ac52a8a89168eea3bcfc572d1537632a42f9d3e771aad2

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