Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbf9cb786500ca68…

MALICIOUS

PDF

68.3 KB Created: 2021-03-14 17:55:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1d20e4879e3fe0ebeb8a2b8e71fcb04b SHA-1: 521502e7482e30f41db8d5b4e09bc846cc75da0e SHA-256: dbf9cb786500ca683689c13f31cbab6818e84892e4fcb9a5382bd16beb01bafa
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded URL that redirects to a suspicious domain, identified as a link farm on disposable hosting. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness. The document body, though heavily obfuscated, appears to reference search terms, suggesting a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://bologen.ru/wix?keyword=campbell+biology+in+focus+3rd+edition+ap+edition PDF link annotation
    • http://xilenemivagola.mywebcommunity.org/tarorakugiz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://02274cc9-8b57-4441-be19-e46c089ec46b.filesusr.com/ugd/f11b8f_ede006560c9442beba59b4cb7efca3ef.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/72533340-d768-47db-a04f-bdb6d7d2edac/90898945201.pdfIn PDF document text
    • https://9fbaa0db-fe9e-443e-b503-3d02ea494c21.filesusr.com/ugd/d417e9_3eacc65c3ec74883bf59d8eaf297034b.pdf?index=trueIn PDF document text
    • http://rijemow.onlinewebshop.net/vizio_2.0_sound_bar_sb2020n-h6_review.pdfIn PDF document text
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_e0285b43688046feb32168d0fcccc87e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc7b0396-8b53-422c-a20f-45c9e4927a1c/53813005846.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/economic_development_council_of_st._lucie_county.pdfIn PDF document text
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_9dcbc5eefccc465db14cd33f885dc0a6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/watajive/allen_and_heath_gl2400_internal_power_supply.pdfIn PDF document text
    • http://lafagelupuf.myartsonline.com/value_of_higher_education_in_india_essay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e809c4f-873b-40ed-a97f-a374795737ed/31741436139.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c48190fe-b61a-4659-b930-38230650d064/pedulesakikazekobi.pdfIn PDF document text
    • https://0ea28b16-58c2-472d-b6be-3e97fe9b7bb6.filesusr.com/ugd/696b8a_135a0a40cb844e8cab4ac67b0e725e3d.pdf?index=trueIn PDF document text
    • https://0f926834-650c-4d5a-b53c-ad60ae412ccc.filesusr.com/ugd/6a44d8_2ec18a6a59d44572a75e2771c3bcf6ef.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0526315-2e09-4b87-b6c3-9c1c4c91a011/77724648775.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cefc2917-51ff-42e8-b248-baa3f80b100c/best_table_talk_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/icloud_dns_bypass.pdfIn PDF document text
    • https://836291d8-7b77-40db-be8c-3105928c7ef3.filesusr.com/ugd/aae074_61b8e195dcf048208940da40bbe51f8d.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_off0000ca20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA20 5788 bytes
SHA-256: c5cf68140110bed47c8b18ab36b197e4dffba92125ff71f209d82615642f2d0d
font_01_sfnt_off0000ddc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC0 10800 bytes
SHA-256: 70faf6e21458a7dea3786a6bd7cafcdd4535997e525d666327b65e7fa73ae2e3

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