Malicious PDF — malware analysis report

Static analysis result for SHA-256 59d331bfb4767e7d…

MALICIOUS

PDF

104.9 KB Created: 2021-03-10 04:53:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c501be67ba9cdde6cc79b13582a44e08 SHA-1: 12b527b59b75f148f85c5974b786b184f9e23395 SHA-256: 59d331bfb4767e7d27f2956ce33b3750a8912e5a16e4039a274afd7500fef67a
186 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 0.9997

Heuristics 6

  • 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.
  • 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://nipisod.ru/award?keyword=antisocial+personality+disorder+screening+tool+pdf PDF link annotation
    • https://finolija.weebly.com/uploads/1/3/4/6/134625313/gitexir-xitagolivi-rofalexezeloze.pdfIn PDF document text
    • http://santand-es.com/50569916271hohwx.pdfIn PDF document text
    • http://gufutaca5.xyz/79187945216xhjqy.pdfIn PDF document text
    • https://cdn.sqhk.co/mojekuvugise/bfgfacH/jiropumewenijetefofi.pdfIn PDF document text
    • https://cdn.sqhk.co/boxumiza/gDmgdPl/minecraft_pixelmon_mod_newest_version.pdfIn PDF document text
    • https://majojolug.weebly.com/uploads/1/3/4/5/134595566/e28e19c1f0f.pdfIn PDF document text
    • https://xuvurabog.weebly.com/uploads/1/3/2/6/132696285/b43002bc71.pdfIn PDF document text
    • https://cdn.sqhk.co/bovutolomevo/icVhajc/563616496.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/G0idhaT/1905024357.pdfIn PDF document text
    • http://brumbum2.xyz/51192174813lxl6u.pdfIn PDF document text
    • http://org-fruit.space/95187684912zzafd.pdfIn PDF document text
    • https://zeberafuduzugag.weebly.com/uploads/1/3/2/6/132682167/edfc4c11073e.pdfIn PDF document text
    • https://babixedijifaz.weebly.com/uploads/1/3/5/3/135385025/jipegotepawazax.pdfIn PDF document text
    • https://cdn.sqhk.co/fepefudasor/vjhheji/twitter_lock_icon_copy_and_paste.pdfIn PDF document text
    • http://storezone.info/jibiwinozomavitaruxenoo83xg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://29474179-7c7c-44ae-84e0-3c37792f2e25.filesusr.com/ugd/7f817d_83ddf272c32344b1bffb819c5525c708.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4daf4f4c-d247-49fc-8174-2ca97e74de62/35455453070.pdfIn PDF document text
    • https://70848fb0-0fd0-490a-9360-2ffa38fc212c.filesusr.com/ugd/08e331_4e735e463b0a4a3088bd931a97ab7c4d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/788eeb08-8707-47ea-8238-d432c23dce2c/xoravapibawu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/532aacf4-ee9e-41c0-a92b-999c084917cb/walt_whitman_high_school_nyc.pdfIn PDF document text
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_939d53aa619f425b8e69bf43e67fe5f9.pdf?index=trueIn 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_off00015ec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EC4 5416 bytes
SHA-256: 27eb6e1999ede5ba18b9138256d751c0d43d1d21d21be01a69776f2bd934c1ff
font_01_sfnt_off0001714d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1714D 10700 bytes
SHA-256: 7834f4023231df4e842a39b8bec1f9aa4afa6d128a5dbd048a39f16e0b5509a4

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