Malicious PDF — malware analysis report

Static analysis result for SHA-256 5697d558f3c9b536…

MALICIOUS

PDF

73.6 KB Created: 2020-12-21 15:33:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a18e5af8100dfabb5ac73cb8f3929638 SHA-1: e7d8b024a9f909eaf7e8ceef1b2a0d7c070ccc04 SHA-256: 5697d558f3c9b536c5e6da3c6c7ef5e0398e61fd4113ce7d1cc7749bb31a1a19
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Harvest Credentials

The sample is a PDF document that exhibits characteristics of a credential phishing lure, specifically targeting multi-factor authentication or one-time codes. It contains a large number of external links, many pointing to S3 buckets, suggesting a link farm or distribution mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for harvesting credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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/strik?utm_term=afk+arena+codes+september+2020 PDF link annotation
    • https://bizetuxerupa.weebly.com/uploads/1/3/0/8/130873791/xikosuko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vexeliku/xomixowi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e350cec0-e41e-4b4b-9d7d-aa465838603f/50968111583.pdfIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/corriente_alterna_definicion.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/gadimubedexekerisoriti.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/67478211066.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/fishy_frequencies_lab_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/que_es_biodanza.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/galileo_travelport.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/wegunogobigika.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_off0000e1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FF 5736 bytes
SHA-256: 5246028497cacc0b20461f0cc69f64d7d1f35c44e3774eee32cefaa957e94f3f
font_01_sfnt_off0000f57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57A 10784 bytes
SHA-256: ed431fb719db867aa542b7af23ffed04c2c8f6742fe44c0fc53007a17db53e03

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