Malicious PDF — malware analysis report

Static analysis result for SHA-256 72828c3f7c7f37cf…

MALICIOUS

PDF

76.3 KB Created: 2021-03-09 14:17:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9774043bd4baff1621286d4f16912fe9 SHA-1: 98151e60aebdf76580115f7148b455d031356dc7 SHA-256: 72828c3f7c7f37cf2f629eb999fe26f02cf63fd795d6fd508ebf90fee5f9bbb2
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://maypoin.ru/wix?keyword=words+with+suffixes PDF link annotation
    • https://cdn.sqhk.co/purorenutuw/TjbxEhh/child_care_resources_jobs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487903/normal_5fc5ead8e51bc.pdfIn PDF document text
    • https://cdn.sqhk.co/naludibeg/fPQjamK/restaurants_near_chattarpur_metro_station.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478125/normal_6038cbd3e6147.pdfIn PDF document text
    • https://cdn.sqhk.co/zumedizojas/gir53jf/best_banana_cake_with_cream_cheese_frosting.pdfIn PDF document text
    • https://cdn.sqhk.co/bapulofuw/jdqeilV/the_wiki_game_solver.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ae8c1479-5121-4009-b0ed-8259dbb1205b.filesusr.com/ugd/0aff45_389657f3ec1c436580088c31c246a973.pdf?index=trueIn PDF document text
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_97c44149524447aa938df1c8532368f5.pdf?index=trueIn PDF document text
    • https://e0fa0743-814d-41de-b6a5-47f787911882.filesusr.com/ugd/89d2ef_b1ccb64f3f12420aa250f99d280f3dbd.pdf?index=trueIn PDF document text
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_40e9f00e3a9f4ca88f2dc5232ef5a16a.pdf?index=trueIn PDF document text
    • https://5b2b9875-3923-4577-9ef6-0527498c95e7.filesusr.com/ugd/4e6dd5_88b1494a66b84560b995c7a63f304d78.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cabd93a7-1bdd-414f-b547-87c4c93ccb84/82839069546.pdfIn PDF document text
    • https://16012499-1299-48b0-8cdd-5f23a7749958.filesusr.com/ugd/fafc38_488eeb4eda14483a9981e7eb05d53121.pdf?index=trueIn PDF document text
    • https://cf4de027-7369-46c2-bf93-d69cabef2b5e.filesusr.com/ugd/868b90_479f36574514443ab32baeaa07bdb153.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/038aefe0-da6a-4f18-af73-f67bc02a63bc/childrens_christmas_story.pdfIn PDF document text
    • https://dab7fb03-f2af-4a8e-9cb9-31de623bedb3.filesusr.com/ugd/58b596_1dd57103da1f4467962e2879c0f4fcce.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_off0000efe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE1 4924 bytes
SHA-256: 5e5dd68aa136c5d351eb5b2ccc95b65b6004cd8823c07c1d01dd61760762dd8e
font_01_sfnt_off000100bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BC 10532 bytes
SHA-256: e5b2f236d2fb1aecbdca176919fe6c027408089fe4cdc4e1cd215a09d47e1cf3

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