Malicious PDF — malware analysis report

Static analysis result for SHA-256 593bfff081784837…

MALICIOUS

PDF

74.7 KB Created: 2021-06-08 17:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 48d749db862e780f4a4421936f97e897 SHA-1: a8a42c50fd9611cfe6372b14e074ca78be426428 SHA-256: 593bfff081784837765538d7d15d23f69096b1a87957380622868393c71d00ee
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://ketchas.ru/pbw?utm_term=official+sat+test+2+answers', is directly associated with the document's content, suggesting a phishing or malware distribution lure. ClamAV detection and ML classification strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ketchas.ru/pbw?utm_term=official+sat+test+2+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4374840/normal_5ff967903f30c.pdfIn PDF document text
    • https://jawonuvanez.weebly.com/uploads/1/3/6/0/136021807/527e176675bdd52.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485826/normal_5ff03eb7319f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378848/normal_5fe6361fd1274.pdfIn PDF document text
    • https://nobujowufovipi.weebly.com/uploads/1/3/4/6/134636268/boboji.pdfIn PDF document text
    • https://mafupalitofix.weebly.com/uploads/1/3/4/0/134042392/7540987.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459794/normal_605300ea90008.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465687/normal_5fee1e4ae5567.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/bc3c7152-7326-4390-9922-d475e67cb43c/57243715974.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/034a3249-a4df-4b98-b2f5-1f5af6ba4c2f/mobemumifot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c7bc912-15a8-464f-9bef-cc789e4b99b1/how_to_fix_no_media_device_on_element_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e76fbbe-9672-46d3-a6ad-8b3d69c7c634/59949592797.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a35aeb78-45ad-4258-8dde-32ce4071be7f/dyson_slim_ball_origin_upright_vacuum_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83e4c1c5-2554-4e5b-8dae-0701da30815d/pazefivudivurogoma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3409c88-63ef-483f-b74b-637169a6aca0/i_juan_de_pareja_chapter_7_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7aaeb2d-149b-48ac-9562-3a31ae789831/how_to_use_early_result_pregnancy_test_cvs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33dc2f01-e9d7-43ad-9998-e8a8312b0a29/why_the_postman_always_rings_twice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c30f092-3a07-4d1f-ad9b-c813cd18eb52/bissell_big_green_carpet_cleaning_machine_86t3_vs_rug_doctor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9143773b-d67b-40e7-a39d-2b57260b810b/zonenilixinawozasogafo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5780d2be-4198-417e-a522-45dcbdf84a3e/how_much_does_it_cost_to_ship_a_pallet_internationally.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94a542c8-0ce2-4d55-8e22-b58f3ce6c109/rewoverikuxelulerutufos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c271e89-3025-4860-b6a4-3a74924aad63/29897022834.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb815fd7-1e81-4f46-933d-cf8b281d56c3/msi_n1996_manual_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d85b0d97-a185-4c8c-8968-a9de072a1455/94150518749.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_off0000e80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80F 5128 bytes
SHA-256: be2e08448cf68e53ce47a45136fd047d3156fc8437314c3f85f306b956e88456
font_01_sfnt_off0000f9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A6 10560 bytes
SHA-256: 4cc6f527f734974e9c45a0c4c89b7f42798db8208ee39732482af78433840f66