Malicious PDF — malware analysis report

Static analysis result for SHA-256 a99cc2ec97acaaa8…

MALICIOUS

PDF

80.0 KB Created: 2021-03-30 02:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 5a8125154cbc33e3638fed3c26863bdc SHA-1: 454c4535dbe8e2465e7be0d59a60e59ce9356af0 SHA-256: a99cc2ec97acaaa88eea9a3ff1702853bc829f3d78cd5a8f8c59d560ae577b62
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, including a link farm on disposable hosting, suggesting it is designed to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ponafet.ru/wix?keyword=gryffindor+common+room+wallpaper PDF link annotation
    • http://kernig.online/download_game_3d_dinosaur_hunter_mod_apkyktu3.pdfIn PDF document text
    • http://ultra0.space/can_i_take_my_permit_test_online_in_new_jerseyg7un2.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/char-broil_tru-infrared_portable_patio_bistro_180_tabletop_grill.pdfIn PDF document text
    • http://lunagogafoxoj.sportsontheweb.net/aphasie_transcorticale_motrice.pdfIn PDF document text
    • https://cdn.sqhk.co/xunijejozi/gg7jdew/68634604063.pdfIn PDF document text
    • http://sodowetan.mywebcommunity.org/ditajalokizajivi.pdfIn PDF document text
    • https://cdn.sqhk.co/tupuvojili/jBjhjiW/babemerirubupimigatulo.pdfIn PDF document text
    • http://smartline58.ru/859116215167gpde.pdfIn PDF document text
    • http://viwenok.22web.org/45328821218.pdfIn PDF document text
    • http://jilet1.club/kendall_kylie_combat_boots2s0gu.pdfIn PDF document text
    • http://xatasawijuli.22web.org/vinumarubonaje.pdfIn PDF document text
    • http://classicalnaturally.com/80177543725opj3p.pdfIn PDF document text
    • http://drive4mclanemilwaukee.com/definiciones_de_economia_politica_de_diferentes_autoresrifce.pdfIn PDF document text
    • http://fridgeservice.ru/kontrol_sistemleri_ders_notlar4viho.pdfIn PDF document text
    • http://furniture21.online/luvuravawoxelevitunumuva2zq6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nekonopevijaj.rf.gd/lesejakom.pdfIn PDF document text
    • http://satogitexuvo.myartsonline.com/why_did_they_change_the_ending_of_inferno.pdfIn PDF document text
    • http://jedugapi.epizy.com/sap_transaction_to_check_outline_agreement.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/20254629260.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/ziweferofovage.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/bangla_font_style_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/5523543000.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE528 5348 bytes
SHA-256: ec0a7129463cc9540506ff5fbf6b650004d40d178746a5877877537c3863e26a
font_01_sfnt_off0000f764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF764 10700 bytes
SHA-256: 019635bb535ca5605bf79558a541f3146ca07b42f105fc6f988f951aafab7433
font_02_sfnt_off00011c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6A 16300 bytes
SHA-256: 386cb843e3502b6b63b9120075490fbcca41b0f960a1b3806ecf8e18ba805d2d

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