Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57419780e13158b…

MALICIOUS

PDF

82.9 KB Created: 2021-04-07 20:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: bfa904bfdfe055117a80c25f89dddb24 SHA-1: b1d18f46f2ce7057723b2fc1a7f6c71c7f36824e SHA-256: a57419780e13158bacf4f9efae9b1dccb5f977d53c18b54c514fc7a4495e519d
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. 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 0.9991

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://fokemale.ru/strik?utm_term=what+words+are+not+capitalized+in+book+titles PDF link annotation
    • http://gojovobikazed.iblogger.org/brackets_ubuntu_16._04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454054/normal_5fd9921b2466a.pdfIn PDF document text
    • http://vifofumimugeke.22web.org/pover.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483608/normal_6056fdefdb109.pdfIn PDF document text
    • https://cdn.sqhk.co/xokebuzizo/jeiabao/budixuzu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457573/normal_602196f827d28.pdfIn PDF document text
    • https://cdn.sqhk.co/guxudakakali/tjgQgjF/68451093652.pdfIn PDF document text
    • https://cdn.sqhk.co/vumuwilaj/gghij5D/xetiwuk.pdfIn PDF document text
    • http://dubapevokitux.22web.org/bakapo.pdfIn PDF document text
    • https://cdn.sqhk.co/zirevazul/Ogcjhhb/suppository_laxatives_over_the_counter.pdfIn PDF document text
    • http://xinaxidupazuso.iblogger.org/6th_grade_math_games.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470975/normal_5fe3c7a1da417.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4a0f17ac-6ce6-4c05-9546-25c48d39d9f7.filesusr.com/ugd/cd79e3_69ccec51a3b3424f891edd4fdea8d729.pdf?index=trueIn PDF document text
    • https://51da6a7d-ee05-4a49-87ee-1b74af3aeb07.filesusr.com/ugd/b80405_522c322f9ba2491488b0f6be85f58b0f.pdf?index=trueIn PDF document text
    • https://db6d201d-bdff-4648-9982-d9cfaac7639e.filesusr.com/ugd/98857b_faab5cf39e7740f9befdaf09e21b4e97.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zubata/intuitive_notion_of_dilation_worksheet_1.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/android_browser_update_required.pdfIn PDF document text
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_6ec1b3cc7b224804892fdf454dad7e2b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/37294103640.pdfIn PDF document text
    • https://4a1fbaa0-0e67-401b-a466-96699e2e5642.filesusr.com/ugd/9647bf_e60199c9a1e84cbeac2b4adb5d170b17.pdf?index=trueIn PDF document text
    • https://4590046d-f0a9-4171-b8a0-56ff8c1fe63c.filesusr.com/ugd/0bfb20_f205951ad98c4c788df988824d93ca49.pdf?index=trueIn PDF document text
    • https://5b0e1d79-1acc-45ba-a965-31015372eee8.filesusr.com/ugd/67f5f7_3a9a9bbea81d4ec4851df6ce2a8977bc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/banula/dulamikosok.pdfIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_4299a3373247467bb63f1227b7728f50.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_off00010573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10573 5520 bytes
SHA-256: 1356234eded9b9e0acc6a42f638cd2aadfcf0045e04cf7f280f348dcae9b21e9
font_01_sfnt_off0001184c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184C 10868 bytes
SHA-256: 4f78b36273c49593168d2d4b4201d1ccfafb8f168ac581eeb0b45f131bd35c77

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