Malicious PDF — malware analysis report

Static analysis result for SHA-256 5525568aae0aec51…

MALICIOUS

PDF

74.3 KB Created: 2020-11-29 22:24:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 0315c9a74326987ab4f0a63a4f620c04 SHA-1: d9287b45df542a538e8a563929d8578cc0affac2 SHA-256: 5525568aae0aec51b774cf02ab242594c86bf5b00b1b4253587ef6e80447b5d7
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 0.9998

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://traffine.ru/123?utm_term=fifty+nifty+united+states+lyrics+fast PDF link annotation
    • https://xubuvene.weebly.com/uploads/1/3/1/3/131380433/865368d66db3.pdfIn PDF document text
    • https://tezolujekile.weebly.com/uploads/1/3/4/4/134497819/fiwupikutadujewafuti.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/7bc97ad1-68cb-4dc3-ad9c-0902898326de/goveb.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/vekatigep.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/stick_games_combat_tournament_legends.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42ddd314-d135-46dd-b684-5423ab3e2e2f/fepuponesojifunepi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1afa818f-e719-49c6-832e-bb08d272f784/vepitufix.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/sojomiwotufosopaxadi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4de6d64f-6f9d-459f-a411-439798fe34ba/baidu_antivirus_removal_tool.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/calculus_a_complete_course.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7312b776-563d-4a7f-a3bb-5039f180c07a/heritage_academy_gateway.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e37171ec-70d2-4c01-a356-6f348e986d54/minapusemavatusosumi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/039343f9-7bb7-4668-9158-cde32a283b2a/89381023509.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE605 5072 bytes
SHA-256: 5112b41f2cd22cbef37199e89c319ef2cc4ec7400f02b70fc86cbb05c9468bc0
font_01_sfnt_off0000f768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF768 10904 bytes
SHA-256: 9635eeda6c4460118736387b56e2f68d4859ed7633759c5bc49c5b77310c3348

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