Malicious PDF — malware analysis report

Static analysis result for SHA-256 a215d7b6d82fde72…

MALICIOUS

PDF

74.5 KB Created: 2021-01-07 21:43:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 75fa4f32625334b42e71bd385a981c98 SHA-1: ba84a40b351ed99feb7abee0b39fd26ba3ca0aec SHA-256: a215d7b6d82fde72e19255d5ee6126b112a9baaf625e1f0f59ba1c5129cb81d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, with a critical heuristic identifying a PDF link farm. One prominent URL, 'https://trafficel.ru/aws?utm_term=worship+video+backgrounds+free', is presented as a resource for free worship video backgrounds, suggesting a deceptive lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malicious content via the linked PDFs.

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://trafficel.ru/aws?utm_term=worship+video+backgrounds+free PDF link annotation
    • https://vubilidupetox.weebly.com/uploads/1/3/0/9/130970012/fupodexaxokejok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447646/normal_5fdcfb738f491.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474997/normal_5fb37708ded9a.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/wofaxil/56484581123.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/linking_verbs_worksheet_grade_4.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/57625006142.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/35114338713.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7aa0cac-72de-4b72-9bf6-a111dce2678e/brahman_cattle_disadvantages.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/sazekagupuliva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19cf3316-8844-4806-a4f2-01912e9e4148/70845733426.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/xagojaludaxorobix.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/blob_file_using_java.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/direct_payday_lenders_only_no_third_party.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_off0000e584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE584 5664 bytes
SHA-256: abf6b1b2c2af78ff0b0ae3259792a0c7f914fafb0f745beb63574eba99f92683
font_01_sfnt_off0000f8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D2 10560 bytes
SHA-256: d984a471730253c626fd0d471525bd2b9bd0a6aaea465a77787663cc4ca0a8f0

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