Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a9adba8a930b813…

MALICIOUS

PDF

83.0 KB Created: 2020-12-29 20:55:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: aebbb4278544e289777960bc754641e8 SHA-1: 07fed9439c83ac4ad889d3311f6edd00c53a11ff SHA-256: 2a9adba8a930b813dc23399c815ec4a1a0747974454b164caca097e93bd5eb66
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-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://traffine.ru/123?utm_term=menschen+a1+2+kursbuch+pdf+answers PDF link annotation
    • https://repafajekojila.weebly.com/uploads/1/3/4/3/134305679/5765260.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401732/normal_5f9228330194c.pdfIn PDF document text
    • https://bozaxadoduzake.weebly.com/uploads/1/3/4/3/134306622/060fa4f.pdfIn PDF document text
    • https://barofabilis.weebly.com/uploads/1/3/2/7/132712093/9e177d8dc7921.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/jipowumat/cie_1931_chromaticity_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/the_famished_road_themes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8777983-ce0e-4563-aa45-60fd81175c36/cape_fear_elementary_staff.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/sales_follow_up_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22a41c8a-176e-4130-9b0c-a6b0bccc39d5/kufizunejadutojifisiv.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/sinewaretejaxuzotizoxexu.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/naruto_blazing_awakening_guide.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF93 4300 bytes
SHA-256: c2ffb4782200f6fee6482b564dca6b19551145d33ddf8ecc5b139b410db37124
font_01_sfnt_off0000eec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC2 5340 bytes
SHA-256: cb092eb23030bddadf00cd7264ab141a362b70f50e27a0bd32e2123ef3a418f3
font_02_sfnt_off000100e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E6 15156 bytes
SHA-256: 6805c49a8d04f8f3801f9a480cfb075b3fd2bde7a8c33504307a36124f23c847
font_03_sfnt_off00013037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13037 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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