Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd5f522b2f3ddbd…

MALICIOUS

PDF

74.1 KB Created: 2020-11-09 18:58:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f5c7eac2da9d87b567e67489c73c8629 SHA-1: dba866ce622bf4fb2644e6d10d9f44a3aedca8dd SHA-256: 4dd5f522b2f3ddbd2303bb706cdacf51b84588928a2b347c6bf175b9edd422b3
154 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 routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://cctraff.ru/aws?keyword=ymca+in+san+angelo+texas In PDF document text
    • https://cdn-cms.f-static.net/uploads/4401517/normal_5fa8d7bd7cd72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481830/normal_5fa94fb8397ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367622/normal_5f89c16757693.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378164/normal_5f90fa4914c8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371783/normal_5f99224cccf9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410956/normal_5f95de8e4c4a8.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/b03824b1-630e-4c5a-9c02-0252bcfe20e7/muvunorakusabowoma.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/93212453998.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7d8dfe7-ac6c-4331-80b6-8fd1cf781892/97785585225.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9efa242f-1556-449c-9ebd-01c1abe7abbc/gunuzokegot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f117cec-0461-4221-9cec-20aad9ad0f5c/textbook_of_family_medicine_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05082bd5-b07e-4e24-8f18-d6b54e11504c/81102600374.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e175d05-b541-423d-98b4-070b318ead82/44199284639.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8de4feb6-8700-484f-bd1d-5cebba701bf8/lekiwizafuxavilasavajam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66630772-95a1-460f-8c40-305d1780397e/79792291486.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c805dbd5-ae2a-4e45-8d9b-293098db1b29/rolanopavapababobig.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF08 5052 bytes
SHA-256: f05e930a2f8f90abefdb14ab0139184d706de45d8a6b36d85ab3e98d75f9e285
font_01_sfnt_off0000e02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02D 11340 bytes
SHA-256: 348ae39301315684f8783c6e3a73b0ab3c02d64e96a8c008dc34475288f6c71d
font_02_sfnt_off00010624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10624 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449

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