Malicious PDF — malware analysis report

Static analysis result for SHA-256 9128ff7e0658b090…

MALICIOUS

PDF

93.9 KB Created: 2021-03-22 10:35:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b5d36fd0a5f77cd7d6a0fca218506a78 SHA-1: 96a6cba0458f27258c60fbda0e9a055507f2b458 SHA-256: 9128ff7e0658b0903ccfa0e2fab64a9b5ef8680337edd7b2c8e0787a77f49d20
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-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://lozipotod.ru/123?utm_term=free+ks2+english+worksheets+pdf PDF link annotation
    • http://onlyforyou.space/unbreakable_dog_runnert07d6.pdfIn PDF document text
    • http://msertis.xyz/regofilezaburozumugui4xsr.pdfIn PDF document text
    • http://auth02mobility.com/ib_theatre_collaborative_project_criteriag8x88.pdfIn PDF document text
    • http://azakalaza3.xyz/griffiths_quantum_mechanics_3rd_edition_solutionsnnota.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/b992889f-c7cd-4cd6-9057-8e8d52457a39/badojotuzufadot.pdfIn PDF document text
    • https://19527f6f-7821-4b33-8e58-d909ab9a203f.filesusr.com/ugd/b18fc6_4b56510d8360479d9ae7e2d0cd11f73a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f118e0ca-aa1f-4072-95ad-de9603ec53cb/naruto_databook_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c738f208-49b2-47f9-97fb-628f9522f948/17136750590.pdfIn PDF document text
    • https://s3.amazonaws.com/gazivemon/80622132016.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/57657992942.pdfIn PDF document text
    • https://57fc24c6-ba7c-430a-bdae-05304608b610.filesusr.com/ugd/bc9c68_31faf13fa02e4575b47cbb800a3694da.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/zodalazunifafaviwibebize.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/clinical_laboratory_tests_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f6c06f0-d2aa-4ba9-abd4-7a1cd2bad777/ditotaxedotakoramir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6935f2b7-6fde-4076-82b7-9968580e9a63/safe_haven_adt_hiring.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73520b69-f12a-4373-903b-0f045b857bf0/jokobijerukadosazux.pdfIn PDF document text
    • https://acfc0e76-311d-46af-9c13-f46c112eb424.filesusr.com/ugd/f90bad_055fc8ebc1514fef996dc82b54930041.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab0639af-0a2a-4e3e-8404-ac0ed75b4fc1/81344708146.pdfIn PDF document text
    • https://438c9214-13ba-44a2-8469-a4c97ff43377.filesusr.com/ugd/5d46a0_8224ec553d834746bcab9488484bbc08.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_off00013075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13075 5336 bytes
SHA-256: a690c720f1c2229bc0494d1514d0afc7769808ace5f650378e7dbd0be2d65c81
font_01_sfnt_off000142b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142B9 11168 bytes
SHA-256: 15d265f720dc6a61957b0061c18fa42195531cd1e68187a68a9656870f575cce

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