Malicious PDF — malware analysis report

Static analysis result for SHA-256 5016e600c563ef98…

MALICIOUS

PDF

76.3 KB Created: 2021-04-15 20:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 60cda67547ab1de08e3ea49daf0f5a18 SHA-1: dcbb36f5e36c2c8610cf2d94bb0aedffe17654cb SHA-256: 5016e600c563ef98e8ff7af195a91c6c93072d5d35856f1962665985d5808789
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 0.9998

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://kuzutuzo.ru/strik?utm_term=the+gods+and+goddesses+of+ancient+egypt+represent PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420765/normal_606378547fce8.pdfIn PDF document text
    • http://lonotel.mygamesonline.org/46693568172.pdfIn PDF document text
    • https://mafaredoli.weebly.com/uploads/1/3/2/6/132695491/1972916.pdfIn PDF document text
    • https://faripolugariwel.weebly.com/uploads/1/3/1/4/131453512/8219699.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464702/normal_5ffd3d0d7d6eb.pdfIn PDF document text
    • http://memimusisat.getenjoyment.net/pride_celebrity_xl8_mobility_scooter_for_sale.pdfIn PDF document text
    • http://nextauto02.ru/what_are_the_qualities_of_a_good_teaching_and_learning_aidjro89.pdfIn PDF document text
    • http://es50off.pro/dataduswws21.pdfIn PDF document text
    • http://mscredit.info/plant_adaptations_worksheet_2nd_gradeyoqe0.pdfIn PDF document text
    • https://nikibowo.weebly.com/uploads/1/3/4/3/134354591/dujegosa.pdfIn PDF document text
    • http://believes.space/365181623852mtvm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490125/normal_5fc86e9313ddd.pdfIn PDF document text
    • https://sadewurepoko.weebly.com/uploads/1/3/0/7/130776460/31dc4f4febd75.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_7f0029a2729c4f64b01f1a6262a5a91e.pdf?index=trueIn PDF document text
    • https://3abd17d4-fa0a-4afb-a42c-9ea9e3eabc7b.filesusr.com/ugd/2e16aa_ca0b1d8bc63a4b1eac1622d2c8d3e545.pdf?index=trueIn PDF document text
    • https://3c3713de-992c-4571-92b4-00afcb8cb2c1.filesusr.com/ugd/9dbdb2_b3a0533b54a641298c17569a7092280b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dac47cf4-9d1b-48c9-b3db-5b383dd527c7/what_is_a_good_scientific_method_question.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a837d7a6-785c-4c0e-b862-3f101c675fb4/xurufazewosazut.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_off0000ed58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED58 5436 bytes
SHA-256: adfd1796ce2fd0d64c3af557d4f40e3e85d7dfa4d863c433daaa473a26c1b429
font_01_sfnt_off0000ffe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE1 10408 bytes
SHA-256: 43aed8a2d2943cc49848f0864ebe7e4cdbed00bf0640372db69999b41559a56a

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