Malicious PDF — malware analysis report

Static analysis result for SHA-256 200c81737f1f01d5…

MALICIOUS

PDF

73.2 KB Created: 2021-01-25 13:54:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 35477ec0a20bf84e1ac0b2b5ede05265 SHA-1: eadbe1c1ec1b5085cd7225256bc2613b8c28ec85 SHA-256: 200c81737f1f01d58e2672c121b52938020597648052d3dfb7c54fc9513df40d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which point to suspicious domains and are likely part of a link farm designed to host malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically related to phishing. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites.

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://druttle.ru/123?utm_term=nc+teacher+salary+schedule+2019-2020 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450624/normal_5feb77d96799b.pdfIn PDF document text
    • http://mp4.design/detention_pond_maintenance_near_me2ydp7.pdfIn PDF document text
    • https://jinuvavuvebox.weebly.com/uploads/1/3/4/6/134612635/68a66607493.pdfIn PDF document text
    • https://nofuwotepilob.weebly.com/uploads/1/3/1/6/131636733/6575180.pdfIn PDF document text
    • http://liketime.fun/equalizer_hitch_parts_canada7lket.pdfIn PDF document text
    • http://xuvaguwanolinu.66ghz.com/80843935371.pdfIn PDF document text
    • https://dawemewi.weebly.com/uploads/1/3/4/7/134747996/taxoxevabuxame.pdfIn PDF document text
    • http://registrat.space/81900606392rv5dp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422386/normal_5fd78d1e55fd8.pdfIn PDF document text
    • http://begemot.space/mugunemetalidasr8ixi.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/zetubakuz/similarity_transformation_matrices.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/rifali.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/attendance_icon_android.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/baltimore_inner_harbor_map.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_off0000e131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE131 5612 bytes
SHA-256: ac98443b77860f719c9fa02cf01f955af6601b4ad9108330c95124beb27695fd
font_01_sfnt_off0000f457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF457 10216 bytes
SHA-256: 77c9084f92dc7bc824aa1bafbef6b914076f1355e206fca3a1527d7abcd9bd92

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