Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af3048b2e9bbca1…

MALICIOUS

PDF

76.9 KB Created: 2021-04-09 05:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3768ea0bfa86335c0e83508f2534cebb SHA-1: b0dc746424c85ea639419b22715a4a064b9ff04c SHA-256: 5af3048b2e9bbca1ce3b0c84da03a4c583d668a864955899e236871edfd4fad5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://xajibur.ru/strik?utm_term=motivation+and+learning+strategies+for+college+success+6th+edition+pdf PDF link annotation
    • http://rosutob.getenjoyment.net/vowebowogazibo.pdfIn PDF document text
    • https://cdn.sqhk.co/jufebarur/ibuE3fB/64212948507.pdfIn PDF document text
    • http://kurixuj.sportsontheweb.net/2419675546.pdfIn PDF document text
    • https://cdn.sqhk.co/tevotapomow/jd4Qzjd/86366306533.pdfIn PDF document text
    • https://miboxijudowisu.weebly.com/uploads/1/3/4/4/134491333/2712452.pdfIn PDF document text
    • https://webonuru.weebly.com/uploads/1/3/1/4/131437172/3634713.pdfIn PDF document text
    • https://cdn.sqhk.co/gudupixure/ajiheib/lofolewidujobiwu.pdfIn PDF document text
    • https://sibabaku.weebly.com/uploads/1/3/0/7/130739132/6192725.pdfIn PDF document text
    • https://namoxatiki.weebly.com/uploads/1/3/4/4/134477177/gozozunagara.pdfIn PDF document text
    • https://tawudefategubo.weebly.com/uploads/1/3/5/9/135974656/7a7378aa7010.pdfIn PDF document text
    • https://jutoxanifi.weebly.com/uploads/1/3/5/3/135321179/7946267.pdfIn PDF document text
    • https://rofixuninapo.weebly.com/uploads/1/3/5/3/135313709/wudexok_jazef.pdfIn PDF document text
    • https://ranibifuvif.weebly.com/uploads/1/3/1/3/131381542/fovubisosuj_samanejutujux.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/perurulexi/vaxupam.pdfIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/how_quickly_can_you_learn_russian.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c0eb1fe-7298-41a5-bdbd-b88e3b747374/89095021732.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97409a18-566f-4b39-9ade-94d99b57bf8f/52668507135.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/new_bollywood_bass_songs.pdfIn PDF document text
    • http://tikomiwewo.atwebpages.com/62818785735.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/romeo_and_juliet_exam_answers.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_off0000edc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC6 5636 bytes
SHA-256: ca77ad324914bee17f929fb6f043c006f6fbfe59bb44d2094cdc423c727ed3dc
font_01_sfnt_off0001010a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010A 10736 bytes
SHA-256: 6fc35fa88c629ba2d63aa24d4bd78fbbe1745ba4a4cb0edd8e70da99f7be26b2

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