Malicious PDF — malware analysis report

Static analysis result for SHA-256 9475eb8945d4ae3c…

MALICIOUS

PDF

90.6 KB Created: 2021-03-14 00:28:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bc0aaa4e7113d84b1d011aa6547d51cd SHA-1: 9514008791017f7fbdeaaef38a784410e3270fba SHA-256: 9475eb8945d4ae3c637481d564621d1caa3663a5a0078bf20df87fc30d240ced
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/wix?keyword=the+rotating+sky+student+guide+answer+key PDF link annotation
    • http://juilopkiretlo.ru/warfarin_bridging_guidelinesqg4wf.pdfIn PDF document text
    • http://idealicaitaly.site/725717253581q3yo.pdfIn PDF document text
    • http://spiritstudio.ru/the_ponies_sims_descargar_para_pcajzns.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/liwara/gisalevesimanizidex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f87b7b56-9354-4d80-b2b6-b4265ddd1685/kagejurupozazalometok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3e2b55f-ce90-467e-937e-eccc59a7d0a2/dmc_embroidery_floss_color_chart_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/strategy_games_android_offline_apk.pdfIn PDF document text
    • http://xifudovolamam.epizy.com/22050329391.pdfIn PDF document text
    • https://4eb3a9b5-ca6a-4b2a-896e-878abc754f3b.filesusr.com/ugd/f1ab86_64acd7085de44492b4c90f1f9c08053f.pdf?index=trueIn PDF document text
    • http://muvabeso.epizy.com/9713157016.pdfIn PDF document text
    • http://maxuzenikofi.epizy.com/copd_treatment_guidelines_uptodate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c66ab34-8e43-47f8-b561-1ea553565d1b/koxefo.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/95854602639.pdfIn PDF document text
    • http://fofilelajisemap.rf.gd/sitosadakegaxufaborim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/642781c1-c184-47cc-adf0-1d42c27d682b/cyberpunk_2020_books.pdfIn PDF document text
    • https://f3dcd8e3-6656-4b47-a81e-a993d3c4f2a1.filesusr.com/ugd/aa9ef2_1038775173b04f3a81875f4f26b7e22a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/oxford_student_atlas_book.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/ghost_in_the_machine_cover_meaning.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_off00012389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12389 5260 bytes
SHA-256: 8e44c9c835efe8019a0a93c3de34ec612c45b9822a2da87c56d04f6f0199bb6e
font_01_sfnt_off0001357c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1357C 11564 bytes
SHA-256: f52218104783ba694b46ade4939b82cf8a59cdc3ee1b3012eeedfa785e347b01

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