Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bc4dc6d71aa8b0a…

MALICIOUS

PDF

83.7 KB Created: 2021-03-15 09:47:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e61d0e4100ac3c887390b73fc18d9cf3 SHA-1: b316bbc7de0e89dd6f3d5d5418a12da1b2e454b3 SHA-256: 7bc4dc6d71aa8b0aa3c56c27753e4bfc78cfd3f005f7ad324f2b9ad12933a9ee
176 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1190 Exploit Public-Facing Application

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a cloud-document share 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 0.9992

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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://dafemum.ru/strik?utm_term=software+project+manager+salary+uk PDF link annotation
    • http://ramuwesitavoz.mywebcommunity.org/is_cyberpunk_2020_single_player.pdfIn PDF document text
    • http://jolovomolosubi.getenjoyment.net/vox_ac15vr_footswitch.pdfIn PDF document text
    • http://fukiwurezopukof.mywebcommunity.org/pathfinder_gdr_bestiario_download.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/61e31b0d-cf2a-40dd-9ec6-e235079a0e1a/what_kind_of_yogurt_to_put_in_smoothies.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/56229074094.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/book_binding_machine_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/shaco_ap_jungle_guide.pdfIn PDF document text
    • http://xekabotiwuker.atwebpages.com/94702987293.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/mutixamazasobuxizowofo.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/who_won_in_brown_vs_board_of_education.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f93e0db7-a07b-4b73-b465-ffb5966e7ea0/58947750138.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2720c570-2a8e-498b-a4fe-fdc06db0348c/99804309689.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/65809908374.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/gigumo.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/bitdefender_mac_full.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/13570495908.pdfIn PDF document text
    • https://ee6bc897-aa08-459d-b6e6-b1b1d69fcba1.filesusr.com/ugd/7ba596_7b646541811b49e1adc69256a1d740b9.pdf?index=trueIn PDF document text
    • https://8d40832c-2e2b-4284-8151-bb35a16d80ac.filesusr.com/ugd/05d014_7b394545cd7549fd9ddfa84a97f7e776.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/bowflex_pr1000_attachments.pdfIn PDF document text
    • https://ddd59a73-be73-4575-bd7b-2e5900175f8b.filesusr.com/ugd/5dc0ef_6ded87e8ad6d454aa91af6b87483c833.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/495ab731-d87d-4ab2-aa1d-47e755475fc4/38113261156.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/fodebapimukeku.pdfIn PDF document text
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_0c491ae66639496db186d81239b3ec63.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_off0001095f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095F 5772 bytes
SHA-256: f09ffee7c66234ec79f32f67fcaa7432221834ce8042f9fb14207fcd6eb2446e
font_01_sfnt_off00011d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D13 10480 bytes
SHA-256: 821a362619b4f480a3e4acbfb0e28a4e34deaaacff2b6ee531c6e51a21b37467

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