Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf19fb940b766294…

MALICIOUS

PDF

91.9 KB Created: 2021-03-27 23:01:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 94c796bec503e9652223e42e127ae44d SHA-1: 6af9bde0b3db0fb61359884eca58e8ebc112b2e8 SHA-256: cf19fb940b7662941290cc3078b18c3d6ece6e3f170d01911c51ff3c58223215
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a suspicious domain, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=landstar+pay+truckers+report
    • https://cdn.sqhk.co/tovisegag/zleIgeN/judomapuvetutesovov.pdf
    • https://cdn-cms.f-static.net/uploads/4415748/normal_5fd8fef50330b.pdf
    • https://cdn-cms.f-static.net/uploads/4470837/normal_600dfb3c8ed34.pdf
    • https://cdn-cms.f-static.net/uploads/4443371/normal_6026d18996412.pdf
    • https://cdn-cms.f-static.net/uploads/4378149/normal_6045ef8f01b6f.pdf
    • https://cdn-cms.f-static.net/uploads/4419191/normal_603a108ec8f7b.pdf
    • https://cdn.sqhk.co/tewokozogop/dhbhhgc/31242643502.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/satuja/3173671180.pdf
    • https://ff0b3df2-dc61-4aeb-9024-93fa9b5bc175.filesusr.com/ugd/aa14a9_595ed41a878f471c8a1797da76d11196.pdf?index=true
    • https://s3.amazonaws.com/tizowodifi/63410880499.pdf
    • https://s3.amazonaws.com/daniwodug/55946000689.pdf
    • http://suregemebibu.rf.gd/gefixazu.pdf
    • https://s3.amazonaws.com/rujimidujek/how_to_warm_up_for_a_1_rep_max_squat.pdf
    • https://s3.amazonaws.com/paxunu/best_web_browser_for_sony_android_tv.pdf
    • https://09235f31-469a-4613-94fc-36d04c1f642a.filesusr.com/ugd/8b6407_90b835eec7dd4c9280e628f02c977d5c.pdf?index=true
    • https://2cfcb734-ec62-4cd9-b61c-03d4762ad765.filesusr.com/ugd/a891c0_41cf99b83f6a4ed09ac2322040d69743.pdf?index=true
    • http://dativolulonal.epizy.com/ruxazatararojedetutixape.pdf
    • http://bubilegire.epizy.com/degree_of_adjectives_worksheets_for_grade_6.pdf
    • https://aa514bbb-a96e-4bc9-8ff3-0ca2edd1104f.filesusr.com/ugd/3fc21f_04ce7da2659143b7bc68b88b93b4e65e.pdf?index=true
    • https://409b2d23-5c1d-402e-97df-26c0da9299b0.filesusr.com/ugd/2e3d42_fed88d3bb28c4cdb9cf8589c30da87fd.pdf?index=true
    • https://s3.amazonaws.com/rikolesafuwofar/50520299322.pdf
    • https://s3.amazonaws.com/fajetufekejo/caribbean_kallarai_theevu_tamil_movie.pdf
    • https://s3.amazonaws.com/resisuna/kebetijewijeba.pdf
    • https://s3.amazonaws.com/dubiditiginowo/300_blackout_180_gr_subsonic_load_data.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104d7.bin
6b7868d4ef96c7109a36d7b580d1fdfc8c181ba3c17144a38bca1d8374e453db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104D7 4976 bytes
font_01_sfnt_off000115d3.bin
1eb4c04278e207aa1d6816652e3f30b2e70f005be3a27d5af3e6fadc6646f967		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115D3 11456 bytes
font_02_sfnt_off00013d52.bin
ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D52 16092 bytes
font_03_sfnt_off0001521a.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1521A 4324 bytes

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