Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d550e01c4b6dca…

MALICIOUS

PDF

86.3 KB Created: 2021-04-25 12:40:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4ee555f22f0d57252c3425a27ac6e3ca SHA-1: 23cb5a97bf6e66bec6b9edcfdb8ed9559e1a6969 SHA-256: f8d550e01c4b6dca030aba30bc114b9b861565c547f325f2452ee4037a7d75c1
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 as a link farm, and one of these links points to a suspicious URL. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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 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.
  • 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://resalured.ru/strik?utm_term=can+you+play+fantasy+football+for+free PDF link annotation
    • http://max-lifting.store/803451988777069h.pdfIn PDF document text
    • https://cdn.sqhk.co/jasowipe/Xrvhhih/assassin_s_creed_odyssey_companions.pdfIn PDF document text
    • http://de-bewertung-id-q2e5t23.top/how_to_do_coconut_oil_in_hairc9c80.pdfIn PDF document text
    • https://cdn.sqhk.co/daxegajok/ggdlYw0/pixel_car_racer_hack_ios_download_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/siwuvulutip/ia3eLbU/41037577471.pdfIn PDF document text
    • http://clientesdkb.com/21067713139j05mf.pdfIn PDF document text
    • https://cdn.sqhk.co/dekavaka/fhClqjh/18166743388.pdfIn PDF document text
    • https://cdn.sqhk.co/vopupevomate/6LSzvgh/national_corvette_museum_motorsports_park_bowling_green_ky.pdfIn PDF document text
    • http://sreda.city/lujowebawizowararh1pp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fc060a1e-8c1d-4b7d-bafd-75f79d4c6355.filesusr.com/ugd/c0a468_6d678355554c41b9b0086ccebc4a3f52.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fadedosi/formation_barman_afpa_bordeaux.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/jubufelupubukogefawanefiv.pdfIn PDF document text
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_30ec446ab9084c56998483720f1ddb14.pdf?index=trueIn PDF document text
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_e57b6b0ce6c347edbc27ba2007c544f6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/goveruduzewoxu/besepozazulan.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/8972516308.pdfIn PDF document text
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_8b10e2fca3b04047a8af442c9a6662bd.pdf?index=trueIn PDF document text
    • https://46c19374-600d-43be-a5f2-d8bf07c6fddf.filesusr.com/ugd/cc94a4_4dacb08844d544e7828599a4a207dc70.pdf?index=trueIn PDF document text
    • https://48b7024d-7414-4593-b44d-ed892b96ad15.filesusr.com/ugd/3e5db3_9a9f12cbdbbf4ca7875985a68aacae6f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jusuberu/math_fraction_addition_and_subtraction_worksheets.pdfIn PDF document text
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_045e3e197e42486a80fd94e1e8725d95.pdf?index=trueIn PDF document text
    • https://83662c7a-80c1-4e94-b5a4-3df479670d58.filesusr.com/ugd/27be29_12d71ddc180146bb88d662e48ce9c15b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/36727109734.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/acls_recertification_test_answers.pdfIn PDF document text
    • https://d5aacb37-8766-4234-9cc8-c2ec3b911aba.filesusr.com/ugd/1e723b_d655e7bc22d4450e88512480f23cf541.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/zudowu.pdfIn PDF document text
    • https://35057dd6-1d18-4acd-96c9-af3b7fddc7cd.filesusr.com/ugd/978dd5_39057b8649b544dc8200b0a976a2d867.pdf?index=trueIn 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_off0001128f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128F 5040 bytes
SHA-256: 4c715897fbf445b04c00e8a156ff358f0df13dbe2fb01a992f7e62a58b1af946
font_01_sfnt_off000123c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C6 11712 bytes
SHA-256: a21f1fc332a3c4ee954c0943f1f82caef5ae265c0d1b0922964d2b9857180154

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