Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad2b0b482d695042…

MALICIOUS

PDF

67.8 KB Created: 2020-11-18 04:56:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 5bc221331b150078f19eea61fc62237e SHA-1: 26823b7e1229f6188d98e3078f2f134579d85cdd SHA-256: ad2b0b482d695042c2c748f7ddd604f1d185f0f39725ca326d52ecbf589449e4
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://trafffe.ru/123?utm_term=sunday+bmx+bikes+review PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420597/normal_5f98e7ce38db7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374835/normal_5fb3efcb1ed59.pdfIn PDF document text
    • https://bidutujube.weebly.com/uploads/1/3/4/4/134403342/mizapawulovigo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369905/normal_5fb3dc6b5643e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406514/normal_5fb400bd5e4ef.pdfIn PDF document text
    • https://dojeviwenos.weebly.com/uploads/1/3/4/4/134491393/559c58be1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365576/normal_5f8d245901af9.pdfIn PDF document text
    • https://weduxuvup.weebly.com/uploads/1/3/4/3/134308116/da0473ebe26a.pdfIn PDF document text
    • https://tezadogiva.weebly.com/uploads/1/3/4/5/134522012/6473950.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/75fac009-03f7-429d-808b-e5796d437ac5/conservation_of_energy_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/najipavez/cars_fast_as_lightning_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c274b511-f161-4985-96c6-874b6d996069/xafudegagikalabaratulax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/889ae0a3-33b0-42a5-b51c-aa1d5e5bd92a/xuxazobotitatetif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2efbd248-ecf7-41d6-80fd-a4a7cc0149bd/winter_jam_2020_ky.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95d1c574-d283-4350-a634-a70cb5f8162c/fejexeronisexeju.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_off0000cb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1C 5568 bytes
SHA-256: 213acb6eb50e25e37be4fa56e145147367f8a9368de42a7b0881f70a369bdd49
font_01_sfnt_off0000de14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE14 10752 bytes
SHA-256: 68f8f67c3d715a3958e6e7ae6d83f444f465088b5b61315e40d9f6f0d70b2c15

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