Malicious PDF — malware analysis report

Static analysis result for SHA-256 712cf40d4ead48c4…

MALICIOUS

PDF

74.9 KB Created: 2021-04-03 04:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9f0f67b668fe1d8bd7f2c0c78a1eef31 SHA-1: e50805b99022c8861214d481a58921c05a575d55 SHA-256: 712cf40d4ead48c43f30b822e19d549cee03e2c11ca9a3e7e1ac1459629fea21
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9998

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://vilenefex.ru/wix?keyword=adding+nickels+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501774/normal_606790c524136.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422148/normal_604cedcf98ae4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://44bb6ee8-a0fe-4f72-890f-0f0a2fec05cf.filesusr.com/ugd/b65acf_08f376ea24a946749bae71bfbebf5706.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xetasif/wishing_well_nursery_bingley_ofsted_report.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/white_christmas_tree_red_balls.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/20184696522.pdfIn PDF document text
    • https://s3.amazonaws.com/jawusawar/vulanabemiretu.pdfIn PDF document text
    • https://s3.amazonaws.com/lotibabakuj/heliospheric_current_sheet_crossing.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/vigatubisaxejexodubif.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/94602437922.pdfIn PDF document text
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_4d7df7d140f745ed9037ab0e5e436b95.pdf?index=trueIn PDF document text
    • https://0621cc9e-6449-4e8a-a8bd-baee9ad62a2c.filesusr.com/ugd/affb4a_c3df791296f145f2869ae2cd3ae72a28.pdf?index=trueIn PDF document text
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_37457b0242f440988bedf7cf47f450d0.pdf?index=trueIn PDF document text
    • https://df9240ce-57b4-430e-a582-521170ca5232.filesusr.com/ugd/10b03a_9e64cc41455c493086f109a262ce3485.pdf?index=trueIn PDF document text
    • https://c63359c4-faa5-40af-ad11-254ddd3d100c.filesusr.com/ugd/838c33_3d2820701e0f4c7bb769149ecabed29e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xupimaral/scott_mccloud_understanding_comics_chapter_1.pdfIn PDF document text
    • https://5849b288-062f-49f8-a71b-da420f1f00fd.filesusr.com/ugd/c068f8_26f13df841d94f57b85ed42d8bc61b38.pdf?index=trueIn PDF document text
    • https://deed868a-3c3f-4b0d-b3ae-f9ebe8a38c33.filesusr.com/ugd/95283b_94d50ed0f35a41d1ac61904ceed8eddb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/43241329919.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_off0000e666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE666 5136 bytes
SHA-256: f9e9f01119bc3eada835eea199ebd768c418758e7e68e42d825405bb2495a9d3
font_01_sfnt_off0000f7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EE 11460 bytes
SHA-256: 87d2bd414cb2fe7599a51306bc0d9d639a4e0b263db89db08eae85243a3b6eb7

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