Malicious PDF — malware analysis report

Static analysis result for SHA-256 f77e5db52873b2b8…

MALICIOUS

PDF

76.3 KB Created: 2021-04-01 01:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e7ce8178edcf14ebe0a9280cf97d175f SHA-1: 0eb66f4ce01ea0081c7815d671236309db441600 SHA-256: f77e5db52873b2b86d62d9a4ca84e8bddbd5577716fbcc67aed2290cbdfdd041
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-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://resalured.ru/award?keyword=the+bangle+sellers+poem+questions+and+answers+pdf PDF link annotation
    • https://fugakesuj.weebly.com/uploads/1/3/0/7/130776648/c97f7225ada.pdfIn PDF document text
    • http://electorat.org/is_procreate_pocket_free_on_iphonelw4si.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484815/normal_6062806986ad6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384323/normal_600f7adfcd2d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481422/normal_5fd9608142185.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373527/normal_6057a47b2371a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374859/normal_605aa15fd1fb4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465145/normal_5ffa378fbe1ad.pdfIn PDF document text
    • http://oneitshop.pro/kindle_touch_users_guide_3rd_editionm21c7.pdfIn PDF document text
    • https://kowezuvive.weebly.com/uploads/1/3/4/6/134603832/1969088.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451019/normal_5fcd9ffae2ea1.pdfIn PDF document text
    • https://zugedogal.weebly.com/uploads/1/3/4/7/134748632/dagunitemejiwojereze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/228627e0-a349-4cb2-9a51-6b6c3684e1f1/gemet.pdfIn PDF document text
    • https://9fb0fece-6c2a-4f8b-8ff1-5d9ea67f5ee7.filesusr.com/ugd/f6a907_e079533edf424c44ac3e38220cb769d5.pdf?index=trueIn PDF document text
    • https://882e4f53-a7e1-4d4a-89e8-a6e6d9f9b805.filesusr.com/ugd/9a13d2_cfb02793909c4ad082736bb8c5f17ba4.pdf?index=trueIn PDF document text
    • https://79d8ee67-2172-45f8-9737-086b37aa5bdf.filesusr.com/ugd/2ab2ae_8a87815e018844db90c29e099ba11894.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4682b9b-af77-4d6c-8e01-e0c0b66bb5e0/concepto_de_salud_segun_la_oms_y_ops.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b8651aa-ff15-4f2e-a1ba-979f7d6fd24b/sinners_in_the_hands_of_an_angry_god_imagery_analysis.pdfIn PDF document text
    • https://f414df59-d0c5-412c-8277-160bd92acc6e.filesusr.com/ugd/055bb3_8b5a4a3719064f2ba0f3843fef6f8123.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9969ea72-ac0e-42b7-a651-f11e043b6433/7717939565.pdfIn PDF document text
    • https://945c5b1a-9feb-4a08-b72d-c905ca1b1520.filesusr.com/ugd/27135d_8540f240799442b190dd35c6d985c5f8.pdf?index=trueIn 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_off0000f369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF369 5760 bytes
SHA-256: 28a0445b48f265256e23c55975631d82d7bd9a87f76591e7efe294167a10677c
font_01_sfnt_off000106d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D9 10688 bytes
SHA-256: 761153844f2f5af7cb06000d53c9820c4e0abaa4da201fa7844424d7c8663fe9

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