Malicious PDF — malware analysis report

Static analysis result for SHA-256 f009ac8d06c4f83e…

MALICIOUS

PDF

76.9 KB Created: 2021-01-08 07:31:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 58af08d6ea396047a8a5e4d32956aac4 SHA-1: 24a20723e52849b6c1cdea6befc07b58e0c27eed SHA-256: f009ac8d06c4f83e079e2cbf0187ace600c43c26283e70944823e71bbd9febe0
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains an embedded URL pointing to a suspicious domain, identified by heuristics as an external URI and flagged by a machine learning classifier. ClamAV also detected this file as a phishing trojan. While no scripts were directly extracted, the presence of an external URI suggests an attempt to redirect the user to a malicious site, likely for phishing or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffi.ru/aws?utm_term=valiant+thor+libro+pdf PDF link annotation
    • https://cdn.sqhk.co/mewowoji/GygjUJQ/magic_world_championship_2020_twitch.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393186/normal_5f91253becbbe.pdfIn PDF document text
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/ae327760746.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374535/normal_5fb7e69c1b1e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385424/normal_5fe1cde0e8242.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476758/normal_5fcc73ab5e1f2.pdfIn PDF document text
    • https://dufofumiwiz.weebly.com/uploads/1/3/5/3/135309849/c2f801489c8a8.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/6f7c46ab-47ce-4122-a58a-85c85cdd9ece/text_dependent_question_stems.pdfIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/times_tables_worksheets_year_2_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/kudibarigimiworesuxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0b91672-0116-45d6-9f35-9abd23709ff9/pogejefesowajulu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc3934b5-fdb4-451f-a54e-04bdf0eb2efa/koxuxabisinijokowi.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/74534245003.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_off0000cc43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC43 5056 bytes
SHA-256: 1f54733893322341aa6862ac205c8e8a9e64ce140c402f81b2b86727db4bb85f
font_01_sfnt_off0000dd5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5F 3508 bytes
SHA-256: 59a03f1c10772b7fdb5e8ee65f9dded9d892681beba1b32f06609026efae7059
font_02_sfnt_off0000e99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99D 11312 bytes
SHA-256: 42b1a9b679a81f867ac555447537ef024c3f13caa3d8d3053f3c7a299b5c8ccf
font_03_sfnt_off00010f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F89 16544 bytes
SHA-256: 643e13312beda441a3295d821e40a5d84ecd522df89387c8cea62704dc58697e

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