Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2f27e7aab905154…

MALICIOUS

PDF

75.1 KB Created: 2020-12-20 13:49:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f5248d4434f2f2d6e11d6bafd183414a SHA-1: 43765f06c709b5962280b034e9509ba6097d8fbd SHA-256: a2f27e7aab905154810fdbc11f9c139d780444c6b418cc09a6f5115a2bef79d1
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 0.9995

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://traffset.ru/strik?utm_term=solving+quadratic+inequalities+algebraically+worksheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4495997/normal_5fded573f0715.pdfIn PDF document text
    • https://givurili.weebly.com/uploads/1/3/4/6/134605008/8656646.pdfIn PDF document text
    • https://fosaxobe.weebly.com/uploads/1/3/4/8/134882536/ed7322d8.pdfIn PDF document text
    • 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/busutafitufe/puziwaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f4112dc-656c-4d79-8dbe-f081e65ea77c/purdue_owl_apa_table.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4769cecf-81a7-4d2b-9ed8-30c0ea04b57b/tinegameb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f7ffdff-b092-46cc-b7cb-b47497ba3193/unblocked_games_world_championship_b.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/52969056380.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c9fbd06-f9f4-49d2-b7ed-6123cdd7bf2e/algebra_with_pizzazz_answer_key_page_64.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/congoleum_prelude_sheet_vinyl_flooring.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c60c3b8-2741-4642-a5c7-530e1aeaed7a/labeloguxon.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/writing_neutralization_reactions_worksheet.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC208 5768 bytes
SHA-256: d096ce8e496eca329c10252b0273ae76de118673155625e088014ad2cc1d47dc
font_01_sfnt_off0000d5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AE 11088 bytes
SHA-256: 9eb3dfa5c7471f98e1815528ffcd714d60e0484322f118e690e8df2f6339508f
font_02_sfnt_off0000fbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAA 16144 bytes
SHA-256: f7282090e270060608fdc575ded0b184a97243f724fc845514d2e81390c10c7f
font_03_sfnt_off000110a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A5 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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