Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a3b2f48db719ea…

MALICIOUS

PDF

94.9 KB Created: 2021-04-06 03:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ce4b15bb5e1e639ea258ebfe5a39c7da SHA-1: dd812d4c104299169d7110505738729005b964d1 SHA-256: c8a3b2f48db719eae2ad76366cf48f3959fc11b10f263336f1510bb0a87577f6
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 0.9997

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=what+is+the+meaning+of+angelus+prayer PDF link annotation
    • https://cdn.sqhk.co/luveruzosu/tjigjZv/portal_question_destiny.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473938/normal_6039c43a763c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452861/normal_60309e8ce0c49.pdfIn PDF document text
    • http://gazajujana.mygamesonline.org/49489903112.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501770/normal_60108dd6b4716.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393022/normal_606ba3dfab40c.pdfIn PDF document text
    • http://uaregroup.com/65931398017ivq72.pdfIn PDF document text
    • http://fresh-ita.fun/epic_little_war_game_reviewaxide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456376/normal_602ff828d0143.pdfIn PDF document text
    • https://cdn.sqhk.co/ramazunor/hgghShZ/list_of_disadvantages_of_globalization.pdfIn PDF document text
    • https://cdn.sqhk.co/senuziker/ifnicgh/bexuwisamodonuroxadogexub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_9b2d3c8bf5904bb6b60c4ec80e10e82f.pdf?index=trueIn PDF document text
    • https://a0bbd489-bf03-48a0-8e93-88abd0751e5b.filesusr.com/ugd/370ea2_d07f163e747d42d0a74f5033ef9880b0.pdf?index=trueIn PDF document text
    • http://zonatitusajobo.onlinewebshop.net/51789036900.pdfIn PDF document text
    • https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_2261165fe7be455386904d5c592eedc8.pdf?index=trueIn PDF document text
    • https://298c7861-702e-4dad-8e6b-798164301c36.filesusr.com/ugd/98adb1_7d22d0f04a37432c8716b07a40714874.pdf?index=trueIn PDF document text
    • https://6674166f-eb58-46b1-9d38-a528bc95e02c.filesusr.com/ugd/e38d8e_a94ca2300c8e437a9d83b6f63297b6be.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCE 5432 bytes
SHA-256: bc33b7a177dff07f14815aa591c3c68efbcd8e435349e582a0ca37d9c4df380c
font_01_sfnt_off00012f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F35 12848 bytes
SHA-256: 2f0844ef0f9e8060453fcbb8fdbd1f4016098b1748864a99b52ac6bae6656df2
font_02_sfnt_off000158ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158AC 16300 bytes
SHA-256: 5ea5e0e6b980bfdd6913a3b3eed2e8d9600e1fc1398aa4525ebd318d5da2d516

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