Malicious PDF — malware analysis report

Static analysis result for SHA-256 91fe961531ab72d4…

MALICIOUS

PDF

74.0 KB Created: 2021-03-19 20:43:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 37a78ab45c50a30a1367652adf2eab5c SHA-1: c445ea410176da2cbe219947ba796a68ef46672b SHA-256: 91fe961531ab72d45f47be33e7120ed3749b3dd861d0c13016d91f804bf32010
156 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 0.9999

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 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.
  • 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://leonvi.ru/strik?utm_term=how+to+develop+a+profitable+trading+strategy PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422877/normal_6043e9387d04b.pdfIn PDF document text
    • http://sokojutefame.iblogger.org/44145262296.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490380/normal_60244b58e0499.pdfIn PDF document text
    • http://rozujed.sportsontheweb.net/juwofelefumulixum.pdfIn PDF document text
    • http://sosutisokalelul.iblogger.org/zubikifesinuxi.pdfIn PDF document text
    • http://malalefapop.22web.org/gozogupojelapufajave.pdfIn PDF document text
    • http://pevazaw.mypressonline.com/wositonosivakipevov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b67fa923-03b4-4d21-b555-95ff628d7525.filesusr.com/ugd/1d4b90_4e8dc528710a4141ab7ef2da40a9c928.pdf?index=trueIn PDF document text
    • http://tudulem.rf.gd/kamuxewutapuzem.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/cozy_house_sheets_discount_code.pdfIn PDF document text
    • http://baletax.onlinewebshop.net/free_crochet_pattern_for_granny_square_baby_blanket.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/gold_award_2018_full_show.pdfIn PDF document text
    • http://dovanokeji.epizy.com/85910809159.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/marketing_information_system_definition.pdfIn PDF document text
    • https://52a1af19-6946-4c37-aba6-ab00a30e4874.filesusr.com/ugd/5dc3ca_f474a523a6474266919f89116a79f1e9.pdf?index=trueIn PDF document text
    • https://75e6d08a-b14f-4c2c-bd4e-3e6431d9d11c.filesusr.com/ugd/497a87_acc1e2a9c01f404db32ad26149caa0b8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/effective_communication_definition_by_different_authors.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/jesus_son_of_god.pdfIn 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_off0000e2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AC 5564 bytes
SHA-256: f20b84bdc8ff4699b835f15c230b54a31711a9e9d4d43602371a2819cb79b318
font_01_sfnt_off0000f5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BE 10836 bytes
SHA-256: 4461dabdbf355e1ba1bae990c9ebc1f0f8fc98d295f179fbcd4566e4f2a03868

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