Malicious PDF — malware analysis report

Static analysis result for SHA-256 66a27b4909d975ff…

MALICIOUS

PDF

84.4 KB Created: 2021-05-30 08:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c01ae1aeaf3b2fe7ed2c68859248b1e5 SHA-1: 6c20b9ed20bc19c9b891c858b862b11f454965fb SHA-256: 66a27b4909d975ffc79071d2e23cdc7a3e14db9082cfbf513dbf7f37561fae5d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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://xajibur.ru/123?utm_term=mechanical+aptitude+test+with+answers+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4479454/normal_60280572d82fe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410448/normal_6002546a39661.pdfIn PDF document text
    • https://sirakogosi.weebly.com/uploads/1/3/4/6/134600403/nepowe.pdfIn PDF document text
    • https://xirozakopep.weebly.com/uploads/1/3/4/7/134719339/megik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495251/normal_6015eb1949745.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401546/normal_6042aba31bb76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469643/normal_60145d26a6698.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451229/normal_601fe1d496772.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388406/normal_60317a453d600.pdfIn PDF document text
    • https://fivomatimib.weebly.com/uploads/1/3/1/0/131070631/9877.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427105/normal_6032206f2bb81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404103/normal_602979caad812.pdfIn PDF document text
    • https://pexagujunivati.weebly.com/uploads/1/3/4/6/134684520/8393036.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/452a45fb-e5f5-4e43-8867-f8b6965e05a7/premier_protein_ingredients_vanilla.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb3b7622-bc1e-4938-9c9d-ad8a23a01548/25473576511.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac1fdf9d-667c-4e2f-aefe-6fe2e9670bd2/how_to_replace_samsung_tv_power_board.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/075406e5-22aa-447b-ab8f-600519d4d940/15149200196.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5982191-1cc4-48ce-adcf-761c3602be2e/romokipodo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cad3af6b-cf35-48d3-b214-49ca915dc305/lewafefetepo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc971e08-0a13-4572-8ff1-fe84acb3d6f8/how_do_you_test_a_solar_fence_charger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05ac30ff-315e-4a5c-9fc8-f17c3de1d10c/rumofapafeledomajezobalaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3b1f504-627c-461c-a760-abddc2e8de36/dikiwuxilejul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fa75f17-4892-4001-833d-a0811adcc63c/atoms_elements_molecules_and_compounds_worksheet_answer_key.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010be6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE6 5340 bytes
SHA-256: 94df4dc14d4f8d11afc738abe745409d7208386d17f011bac8bf10ae302462a8
font_01_sfnt_off00011e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E25 11232 bytes
SHA-256: ae0f14cad85618465a6a8bd6a2acb1287f30f8fa6fa8a7420847ebd51b8ea448

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