Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed62a9fdfd3405e6…

MALICIOUS

PDF

74.1 KB Created: 2021-01-08 05:27:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b08d67d7b9507a9da7398305dc7aec1a SHA-1: dbed2bdf7109040610d7bb2af48dc5b56f268fdf SHA-256: ed62a9fdfd3405e678da9be39f21e934895ce28f50236a4204e9301efe4e8dc0
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM', suggesting a malicious intent to manipulate search engine results or redirect users to malicious sites. ClamAV detected it as 'Pdf.Phishing.Trojan', and a machine learning classifier also flagged it as malicious. The presence of embedded URLs and the overall structure indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cdn.sqhk.co/jafipago/xjbhdvc/cellular_plus_billings.pdf In PDF document text
    • https://wegakerovosa.weebly.com/uploads/1/3/0/8/130873826/3780208.pdfIn PDF document text
    • https://pozimifekof.weebly.com/uploads/1/3/4/6/134674510/jebimixunifexedez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403948/normal_5f98afe86e744.pdfIn PDF document text
    • https://trafffe.ru/wb?keyword=fast%20battery%20charging%2018wPDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/84328494005.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79f1eb66-1b57-4bea-934f-4422da6c11e5/bujimosolatukuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5bdbea3-5fc4-418e-8b54-9c7267dd47e6/nevadagurukapupokewimaw.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/letter_names_and_sounds_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10b53c08-2c74-4e87-8f8b-8018b12c0168/1100119140.pdfIn PDF document text
    • https://s3.amazonaws.com/gonavo/ap_calc_free_response_2012.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17c3dd2a-27bc-4bcc-b532-761300189264/multiplayer_car_simulator_games.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d3bad29-c2e8-4e29-912c-2ab9ce95c0fa/1503065713.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b86c5fe-f746-443a-b497-401ee6b6ab8a/tazoloxobijepekuxujo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DD 5988 bytes
SHA-256: e88c8d2d5f6fb60e93f42d563a2dcd520c9d8282847985a4bcd4f41ac7b91912
font_01_sfnt_off0000e966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE966 10568 bytes
SHA-256: 8b213dd39adae76005106311636e89bd883044af405bd93714d36fa3292d6dd8
font_02_sfnt_off00010d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8F 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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