Malicious PDF — malware analysis report

Static analysis result for SHA-256 3031da2a681d598d…

MALICIOUS

PDF

74.2 KB Created: 2021-04-01 20:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9689e3a679d6f096780a2fa7cf0e7c59 SHA-1: 7347fa365397b4346b4bd46134b0ae091d844cf5 SHA-256: 3031da2a681d598d3f981e478fe5f5dc7be1b7d23d3cf1a61d14d849772713bb
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 0.9998

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/award?keyword=autobiography+of+a+tree+pdf PDF link annotation
    • https://ranalugepileli.weebly.com/uploads/1/3/4/7/134735155/30022ca55d8e.pdfIn PDF document text
    • http://nebofonuve.mywebcommunity.org/bryophytes_reproduction.pdfIn PDF document text
    • https://xopigitit.weebly.com/uploads/1/3/4/3/134339451/3717711.pdfIn PDF document text
    • http://nadipewin.mywebcommunity.org/bruises_lewis_capaldi_piano_sheet_music.pdfIn PDF document text
    • https://totovipuvo.weebly.com/uploads/1/3/2/7/132740708/ledizizuzifap_kugunuburaweraw_melerenex_dosegawak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://davofunup.onlinewebshop.net/junexujemutezeruwisedudid.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/sosip.pdfIn PDF document text
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_d5c69f8f679949da9af515888bf3b0b9.pdf?index=trueIn PDF document text
    • https://d25e5d79-f3dc-43ab-8538-58f2f4730235.filesusr.com/ugd/898300_a3c8f902d7484023ac38de0049e8897a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d16c8a8-ed4b-4645-a590-bc707da2653a/learn_how_to_speak_basic_korean.pdfIn PDF document text
    • https://1482387f-61d8-47e1-b538-9b7f1e8b89fb.filesusr.com/ugd/538d67_b20825cf463e42fcaa2424e37c86afec.pdf?index=trueIn PDF document text
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_9a87ac6b4a4a49f58a650556681d91ed.pdf?index=trueIn PDF document text
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_1940b4cdab2f4d50be8d030a263aeaca.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bidivo/brutus_speech.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe6684aa-e681-4d7a-9299-be53bbf0309e/1156658364.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/217ab585-a829-4fa5-8958-9bc6406732e2/3d_printing_presentation_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86f45144-2e80-4e25-9226-b7086169caad/best_champion_inverter_generator.pdfIn PDF document text
    • https://2a07c75e-e898-48ba-b326-4cccc82d0599.filesusr.com/ugd/ff154e_df9137373c6c4ee69c4ea48f8d80c5f3.pdf?index=trueIn PDF document text
    • https://467375c7-a7a6-4806-a9b7-892c2a528f89.filesusr.com/ugd/911174_e8852040a2be44dc8034ef17834302a6.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_off0000e3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D5 5324 bytes
SHA-256: c71413f264fb07960a51bf5c52b3aa6131e562cb8f2a79aaf896167fba822b5d
font_01_sfnt_off0000f5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F8 11028 bytes
SHA-256: 636fa905b55caf4b51d56d792609e97bb87d29835b8e39656588a2273f133e79

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