Malicious PDF — malware analysis report

Static analysis result for SHA-256 d52da92d588cc643…

MALICIOUS

PDF

74.9 KB Created: 2021-03-13 13:40:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4a220dd4fd3859d4f6b60a18c05d10d1 SHA-1: 13c2e07c454a727d2918691b303756f63c2191de SHA-256: d52da92d588cc6436ac5493efe98963a54ddb7c31675f0cf1f38c43952e11f29
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 0.9999

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/award?keyword=mba+cet+2020+notification+pdf PDF link annotation
    • https://cdn.sqhk.co/kisudosus/fFmQFeA/kleptocats_2_codes_for_gems.pdfIn PDF document text
    • http://nesarose.sportsontheweb.net/lepiwejovetazorasem.pdfIn PDF document text
    • https://cdn.sqhk.co/xalibolopov/b3jd1hb/momoworekenatekezejeron.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d75bbb92-b0e4-4b50-83e6-2443e695523b.filesusr.com/ugd/bc73b9_adb8f75f35d742278c26f917194e31bd.pdf?index=trueIn PDF document text
    • https://6f465708-eb37-4ee2-8658-ebeec6cd93ea.filesusr.com/ugd/4bb103_ad8d732dc77043a887ad56701333ab56.pdf?index=trueIn PDF document text
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_b7777941329941b7a0ee9b1d33261aac.pdf?index=trueIn PDF document text
    • https://e824aeac-d22a-4b45-bb3c-17051d6ee04f.filesusr.com/ugd/de60da_5cb50ea5ed084ea492e1d42b3472e123.pdf?index=trueIn PDF document text
    • https://b3d988c2-7a7d-4c3c-9141-221b6550481e.filesusr.com/ugd/9dda13_e6509fe184ac468ea780b7b7f5da0f12.pdf?index=trueIn PDF document text
    • https://ac685e6e-6442-44c0-91a1-b3a367e79ef2.filesusr.com/ugd/ce77c6_358abca1f0bb4a339a53c3834ef64bfb.pdf?index=trueIn PDF document text
    • https://70848fb0-0fd0-490a-9360-2ffa38fc212c.filesusr.com/ugd/08e331_af73c9de476d4f12a7af568905c96175.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/132cef4c-9de6-47f1-b5dd-f1af28cf82f4/the_end_of_the_f_world_soundtrack_download.pdfIn PDF document text
    • https://f2203da8-4034-475c-a980-a37079f2cd7f.filesusr.com/ugd/d29026_1c47f36d8ff1451f8a4c9e49c1e16136.pdf?index=trueIn PDF document text
    • https://504706c9-3a86-45eb-876a-6494ef133fff.filesusr.com/ugd/80c1db_70ee773e996b4409bbf8a155b535714b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab147c9a-5867-4ab6-b0eb-0763e3174603/linksys_ac1200_max_wi-fi_range_extender_re6500.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c2e2282-e069-4805-be69-11d3cdfa546e/71004855578.pdfIn PDF document text
    • http://dojafeduzig.myartsonline.com/gazetted_holidays_2020_hp.pdfIn PDF document text
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_41af2ee74e7e40c4a8add8a122fb3449.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_off0000e594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE594 5264 bytes
SHA-256: 605fc2c6dcc9d3dba2dfdd9b634f51b37a99096e0103b03a6c2832f2cc8dafd6
font_01_sfnt_off0000f79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79F 11012 bytes
SHA-256: dc8b8380e422de98088915cfb16e873511aad3f6421e6a1d8b272a19003e8414

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