Malicious PDF — malware analysis report

Static analysis result for SHA-256 05823d4793ef80eb…

MALICIOUS

PDF

75.3 KB Created: 2021-03-22 15:30:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7bef4d8e3970d48974052a52905f7661 SHA-1: 24d275c96fc02ef603ca812b03ec4d21b44773cc SHA-256: 05823d4793ef80eb66c9f2f5b706990f075d8d888c7f03bc3e2b1ebddc952214
156 Risk Score

Malware Insights

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

The sample is a PDF file that contains a large number of external links, many of which point to potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of numerous external links suggests an attempt to redirect users to attacker-controlled sites, possibly to host further malicious content or collect credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/123?utm_term=a4+cuboid+net+pdf
    • https://kazedodaregiz.weebly.com/uploads/1/3/4/3/134368633/4009489.pdf
    • https://xudixakutax.weebly.com/uploads/1/3/0/7/130776611/kukawinew.pdf
    • http://ketaton.mywebcommunity.org/rukibax.pdf
    • http://avto-trokot.xyz/11882079960o8mx8.pdf
    • http://bcipreactivaperu.com/9816822947ammp0.pdf
    • http://dsv-trening.ru/interstellar_cast_matt_damonmqq5z.pdf
    • https://fufarolobol.weebly.com/uploads/1/3/4/5/134597676/fc9678d0e0.pdf
    • http://sallles.ru/medios_de_comunicacion_oral_y_escritagcx2c.pdf
    • https://kobafanosige.weebly.com/uploads/1/3/4/0/134016660/e9e1fa00cd787.pdf
    • http://pugezesiw.mygamesonline.org/garmin_approach_s60_manual.pdf
    • http://xarapover.mygamesonline.org/definition_of_affective_commitment.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://02bc4616-4eae-4b38-b2c9-0e654f754ee0.filesusr.com/ugd/069df5_449fbc1d600e43a7a3ec4778c4c0b16f.pdf?index=true
    • https://s3.amazonaws.com/tumuzu/digimon_world_2_dna_digivolution_guide.pdf
    • https://s3.amazonaws.com/nafamaragisek/tajatajeka.pdf
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_e03ceb41b3c44151aef1f6223fdcad71.pdf?index=true
    • https://17a6c5a8-0587-4adf-8126-5b439e15a62f.filesusr.com/ugd/54bec1_2159d02b93534e0b859dd4c200d24a43.pdf?index=true
    • http://kuwexugebukutim.rf.gd/sociology_book_for_css.pdf
    • http://repafow.epizy.com/mekumazepeburu.pdf
    • https://9e28b13d-ef5c-4d18-821e-e071a8932918.filesusr.com/ugd/0b0738_778cd32422414084926fba0a43730890.pdf?index=true
    • https://7c8f45b7-e058-4e27-bccd-8ee7dcb26900.filesusr.com/ugd/d5cf39_9b35e9bd2a784cb0b69184a3daf4879a.pdf?index=true
    • https://s3.amazonaws.com/bejexe/korea_australia_free_trade_agreement_template.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_off0000ec56.bin
66e071983e1625c1c6a128b834e45466da5efb970f9fe8e73786e8e096cba4ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC56 4852 bytes
font_01_sfnt_off0000fcf7.bin
11f4dfd2c367a25c94c0a9e8c9dc06440b087301d883104187fc7685819524bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF7 10280 bytes

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