Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef6b17524bbed327…

MALICIOUS

PDF

153.9 KB Created: 2021-03-24 04:16:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 1de233533cc8b50b5858e18e74c7f2d6 SHA-1: 2b710f137a68df0a907d681c6e477699a97ef5ff SHA-256: ef6b17524bbed327d5185ac652f254d185420a9cf9b00a05ce38b8a519b244cb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to disposable domains and employing UTM parameters, which is characteristic of phishing or malware distribution campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ponafet.ru/aws?utm_term=gregor+the+overlander+movie+cast PDF link annotation
    • https://cdn.sqhk.co/tedefoso/jIjfDhj/star_wars_x_pandora.pdfIn PDF document text
    • https://cdn.sqhk.co/lupobikud/jiDPC6e/nanomemadawemexususugomez.pdfIn PDF document text
    • http://disupata.iblogger.org/student_admission_number_format.pdfIn PDF document text
    • https://cdn.sqhk.co/pujimuxuja/5xhjhhc/30880630029.pdfIn PDF document text
    • https://cdn.sqhk.co/pabefidinaz/hjcTjcr/kurazegibotosib.pdfIn PDF document text
    • https://cdn.sqhk.co/velomegu/MUie2ie/40247322977.pdfIn PDF document text
    • https://cdn.sqhk.co/paxepilekot/hUig9ic/mass_from_sharepoint.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/gwwjdhg/eastern_front_june_6_1944.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/skewed_data_distribution_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcdad99e-82d1-4aa8-af3e-5f23f6a30dde/snap_on_2000_psi_pressure_washer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a600ec82-0d69-4f6d-88f0-46b90e51113d/deep_sea_fishing_rods_for_sale_near_me.pdfIn PDF document text
    • http://bezafesu.rf.gd/westward_expansion_manifest_destiny_and_the_wild_wild_west_map_activity_answer_key.pdfIn PDF document text
    • http://rebokomixuxoj.epizy.com/sefenejoxat.pdfIn PDF document text
    • http://vavuliremu.rf.gd/dapefuvoxivilon.pdfIn PDF document text
    • https://b5d51143-f34a-4a4f-9265-6917490cb775.filesusr.com/ugd/9f69bd_9be254d612d346f4bb0e1ae572b6d83b.pdf?index=trueIn PDF document text
    • http://zigazus.rf.gd/manual_dbx_166_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7eef104-9eb2-4991-b1d9-7a89df49eafd/juzibex.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/25146686743.pdfIn PDF document text
    • https://s3.amazonaws.com/mosezavor/72998296495.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2d4a7db-af6b-41c8-bfaa-58524023b066/quran_english_online.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/onkyo_tx-sr333_5.1_review.pdfIn PDF document text
    • https://d04c2b29-3777-4fe6-aaa9-ab96f87c3324.filesusr.com/ugd/43eb95_ec8cec3c4727436bb256e57bd2402bcc.pdf?index=trueIn PDF document text
    • https://e082cb0d-9c22-4a21-acb7-e2c6127a51d3.filesusr.com/ugd/ff0c06_1800d47f1ac24b1ebe9561f36351dbcf.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_off00021f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21F95 5444 bytes
SHA-256: 25959eda6e9aa4f7219cc324fffa4fca1f4864b1124b1cae8700c11307f1a34c
font_01_sfnt_off000231f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x231F9 11852 bytes
SHA-256: 15d596f310b47a4e3c0b600f444ba45fe4e8d04c3c4f23ddbcc1ec1139f5d0d3

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