Malicious PDF — malware analysis report

Static analysis result for SHA-256 21662d0d0ec384fe…

MALICIOUS

PDF

79.1 KB Created: 2021-03-22 10:37:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a2a40bcfa2be8f2c815bfcfb055fded4 SHA-1: 120b2114928c5e37128006985be5a23ba891f2fe SHA-256: 21662d0d0ec384fe286e672cacc178c1ad50ff39c7942fce523e574ee1ff6142
214 Risk Score

Malware Insights

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

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=crossword+quiz+daily+january+3+2020 In PDF document text
    • https://cdn.sqhk.co/suxujaba/hznigxO/6676073483.pdfIn PDF document text
    • http://hookup754.fun/physics_formulas_for_neet_2020_download7tkgm.pdfIn PDF document text
    • http://xunopapazugatar.medianewsonline.com/bamifutuke.pdfIn PDF document text
    • http://zomosidotewe.sportsontheweb.net/best_self_journal_free.pdfIn PDF document text
    • http://ek-arenda.ru/38117371144dwmke.pdfIn PDF document text
    • http://summ-ita.space/anker_bluetooth_keyboard_codem3aaf.pdfIn PDF document text
    • https://cdn.sqhk.co/zibavuna/hjchgyo/wikupesonulowavu.pdfIn PDF document text
    • http://viwavidif.getenjoyment.net/ma_rmv_permit_test_study_guide.pdfIn PDF document text
    • http://sevagawos.getenjoyment.net/faroruluvakopulujafogas.pdfIn PDF document text
    • https://cdn.sqhk.co/rozesivotix/eWxGYhi/smart_launcher_5_pro_apk_mirror.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_e913444e7de44d0b93114b55e574965f.pdf?index=trueIn PDF document text
    • https://6674166f-eb58-46b1-9d38-a528bc95e02c.filesusr.com/ugd/e38d8e_955d7143391d437aae342808e57e8ac5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dupula/bewotusemimitudubefunof.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/56537584621.pdfIn PDF document text
    • http://lavisekenesavof.myartsonline.com/92079697822.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/estrategias_de_afrontamiento_emocional.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/sapos.pdfIn PDF document text
    • https://00e6f838-d17c-4130-b616-1adf5f4d9bb3.filesusr.com/ugd/714321_c1b7f4bb99e54ac083d5862bed2fa1ad.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/52753801032.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/order_of_adjectives_worksheet_grade_3.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/88462510323.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97B 5412 bytes
SHA-256: 5271f303dec94153576afb0a111348450a909852c35ad290e5132722703e8568
font_01_sfnt_off0000fbf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF7 10936 bytes
SHA-256: 079957bf0b3608183604d1d25c4f69a5ba36778a445fd6b136b6375212c62378
font_02_sfnt_off00012129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12129 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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