Malicious PDF — malware analysis report

Static analysis result for SHA-256 331fb4e2fc4be067…

MALICIOUS

PDF

80.6 KB Created: 2021-03-18 07:05:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: da51cc50bcac0f9d3d84ae8f402a6984 SHA-1: 84d86760fd1e6cb007a04a009ac83e1f45ee0fcd SHA-256: 331fb4e2fc4be067b760915144913f114d98f02fbcb33e9a4e812467942014d2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are obfuscated or lead to suspicious domains, indicating a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://fokemale.ru/strik?utm_term=simmons+differential+equations+solutions+pdf PDF link annotation
    • https://mivojunap.weebly.com/uploads/1/3/4/7/134720575/392b5.pdfIn PDF document text
    • https://fixajunize.weebly.com/uploads/1/3/6/0/136051507/9513544.pdfIn PDF document text
    • https://jowatoziji.weebly.com/uploads/1/3/4/8/134893097/8072168.pdfIn PDF document text
    • https://pesadoxemanuz.weebly.com/uploads/1/3/4/8/134852899/6807245.pdfIn PDF document text
    • https://bexusisase.weebly.com/uploads/1/3/4/5/134596812/satepuketum-xapurume-domete.pdfIn PDF document text
    • https://pakotoroxup.weebly.com/uploads/1/3/0/8/130815058/dekiwenipen.pdfIn PDF document text
    • http://sojosabomoki.22web.org/ancestors_legacy_guide.pdfIn PDF document text
    • https://norudajesopoz.weebly.com/uploads/1/3/4/3/134340776/famuduvinujalim-busewamob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_99d74efb86724bb4bb2183bc7fb56964.pdf?index=trueIn PDF document text
    • http://jipezanegasan.rf.gd/16248213077.pdfIn PDF document text
    • https://02ee9779-94d6-4ec7-959f-c0f99fe19a35.filesusr.com/ugd/cdc607_cb51a1b41cfe4d9783b4548e4c7f212f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/sscn._bkn._go._id_formasi_kesehatan.pdfIn PDF document text
    • https://08b4a39d-fa16-4eaa-91be-ae90003cacb9.filesusr.com/ugd/237bf7_918c16d8a1024c5a81a2da0cd61d090f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nafamaragisek/list_the_materials_necessary_for_photosynthesis.pdfIn PDF document text
    • https://s3.amazonaws.com/dagasopones/how_much_is_50_liters.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/pneumatic_suspension_system.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/88853683450.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/storming_norming_performing_mourning.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/47223737725.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/94332521404.pdfIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_36d4a1e808d4430080061f4e399c578f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gezetega/jizuberanovuzaziwiguke.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_off0000f69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69A 5416 bytes
SHA-256: 72d8b20ee5606f8d4a0ad1b458c951c173f35361544c8e00668afbbab649d1ec
font_01_sfnt_off000108e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E5 12248 bytes
SHA-256: 3cdabaa305b79db916238f3ff270a86170b659c48e2f3dc30d01ea18de547229

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