Malicious PDF — malware analysis report

Static analysis result for SHA-256 92afbc9cc8dcf907…

MALICIOUS

PDF

75.5 KB Created: 2020-11-18 11:39:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f907823fbb94a914c9ef439a65f4342b SHA-1: 1e2db1b47af02528a46ca3db566ada328289cce7 SHA-256: 92afbc9cc8dcf907223bf579a8902e47d47f0b446afa62d4922ae32bdb4bb94c
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/strik?utm_term=getting+started+with+spring+framework+book+pdf PDF link annotation
    • https://naxesitigas.weebly.com/uploads/1/3/0/7/130740165/pivamikutobater.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366969/normal_5fa4d07907bca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388608/normal_5f8e6372ecec7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366063/normal_5f8eaf44da06a.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/kekikefuwu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426545/normal_5fb2e757c303a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384149/normal_5f974baf84556.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/zetare/cosmic_energy_anne_jirsch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/211d1470-0723-47a9-a81a-03f3de8a324b/65127599899.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/629b1cfb-d45a-4611-8bcc-38bb98294850/77610566011.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea52862f-3cd3-4bb8-8ea4-be9ba2ee3dde/fugoxefevude.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcd79084-9df6-4661-843d-76b3b307bb96/taleem_e_balghan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1820b9ba-abd6-4180-9708-98cc0074394c/nazemewekugivajodexeza.pdfIn PDF document text
    • https://s3.amazonaws.com/digigitusuduk/zosuwakipetopukudoluwase.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEE 5540 bytes
SHA-256: 802600b3960a775a97fe3508e31fb2000f6b0b1d89434fa5fa24d896d2c9e418
font_01_sfnt_off0000efac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAC 10248 bytes
SHA-256: 941691a2d3ec31b44ce3bf5f5034b9823a0f97ac52c84958a1ed2b0f402062e0
font_02_sfnt_off000112c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C2 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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