Malicious PDF — malware analysis report

Static analysis result for SHA-256 639a7f700b3afe7d…

MALICIOUS

PDF

71.3 KB Created: 2021-02-15 03:13:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 030e8a06d298abc602a5e8e09a89c44f SHA-1: 14f7557de3fa259603ac9cd7e3daafbfcb0142fa SHA-256: 639a7f700b3afe7d502afb005ea88731d3c2bce3c1ad6f5d0725c76d5116c6b5
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document is identified as malicious by an ML classifier and contains a large number of external links, characteristic of a link farm designed to obscure malicious destinations. The presence of a 'download button' lure further suggests a deceptive intent. While no scripts were directly extracted, the PDF structure and the nature of the heuristics indicate it likely exploits a vulnerability or uses embedded JavaScript to redirect the user to malicious sites, potentially for further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bologen.ru/wb?keyword=ba5201%20applied%20operations%20research%20pdf PDF link annotation
    • https://vowizata.weebly.com/uploads/1/3/1/8/131856430/1c6053190e65022.pdfIn PDF document text
    • https://cdn.sqhk.co/mugukawi/cgcibjc/navefomosotu.pdfIn PDF document text
    • https://wejilosadala.weebly.com/uploads/1/3/0/8/130815097/velezamotikuwug-beponolagudasez.pdfIn PDF document text
    • https://cdn.sqhk.co/juzurupivepo/jwYJhjg/sabavomoz.pdfIn PDF document text
    • https://cdn.sqhk.co/demanajinu/bhehAji/vr_karts_sprint_multiplayer.pdfIn PDF document text
    • http://durukogemegaxib.22web.org/zifalukonopizijurapabo.pdfIn PDF document text
    • https://suzeziji.weebly.com/uploads/1/3/0/7/130739492/1739301.pdfIn PDF document text
    • https://cdn.sqhk.co/fovuxugo/7jdihnW/latest_flower_nail_art_designs_gallery_2019.pdfIn PDF document text
    • https://warororob.weebly.com/uploads/1/3/5/3/135314520/zukopam.pdfIn PDF document text
    • https://tajaxaxiko.weebly.com/uploads/1/3/0/9/130969751/jexipixupuxopigapav.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/aidjj0F/80142536922.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/wutezigojuxi/dereketupetaradopixezed.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/nofebib.pdfIn PDF document text
    • http://rimamosapike.epizy.com/dowodumumoteminamo.pdfIn PDF document text
    • http://nipesuvaz.epizy.com/free_printable_medical_luggage_tag_template.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/91213836653.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/binomial_distribution_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/donut_shop_menu_template.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/92703467216.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/fijen.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_off0000d783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD783 5740 bytes
SHA-256: 23cb2b7740e26ae43fbdc1e4c1f49114e49dc3109969ff84945b2b1e2be963ef
font_01_sfnt_off0000eb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB16 10864 bytes
SHA-256: 4c294db90714ee25eb9783525aeaf1f3dc9baa3366c16e129126607903a288ab

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