Malicious PDF — malware analysis report

Static analysis result for SHA-256 df5601c0e5047071…

MALICIOUS

PDF

66.3 KB Created: 2021-02-10 03:41:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e271e31b1c74f42816928c7e76520742 SHA-1: 80b6557950d081817baa5a1e68a7eafc5da03d33 SHA-256: df5601c0e5047071a0f49b2a9bc96bcf9f24180ab1cfe8bda371eef676c9c199
126 Risk Score

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-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://seumenha.ru/aws?utm_term=capitalization+worksheets+for+esl+students PDF link annotation
    • http://ctuxuu.com/hyperdimension_neptunia_episode_10ezdp.pdfIn PDF document text
    • http://akvatehnika74.ru/volkswagen_vento_1994_manualtjcqj.pdfIn PDF document text
    • https://cdn.sqhk.co/vixawutozama/he7hjXR/61099442288.pdfIn PDF document text
    • https://cdn.sqhk.co/kaxonavi/gichiUr/the_impossible_quiz_book_chapter_1_answers.pdfIn PDF document text
    • http://trackengine.host/copy_worksheet_in_excel_2013sfuoh.pdfIn PDF document text
    • http://servempieza.site/97182490219fhy8s.pdfIn PDF document text
    • http://logvoz.ru/8753243903qzlcl.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/WMgEsks/mi_phones_android_11_update_list.pdfIn PDF document text
    • https://cdn.sqhk.co/javijaxim/14fe2jc/movies_2019_comedy_imdb.pdfIn PDF document text
    • http://1xbet-football.fun/varatewijajuvojibewerewkzkm9.pdfIn PDF document text
    • http://drive4mclaneeffingham.com/rsmeans_2015418h2.pdfIn PDF document text
    • https://cdn.sqhk.co/tinulafi/3gcOqid/23659438810.pdfIn PDF document text
    • http://easycreditscore.info/vijamibogokigufic3vef.pdfIn PDF document text
    • http://hookup157.site/pevam4id64.pdfIn PDF document text
    • https://mimudokax.weebly.com/uploads/1/3/4/7/134742140/3068025.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C8 5240 bytes
SHA-256: 93dda530348e39371347392f9095e54fee15324821b29ef9b291095bac4aacdd
font_01_sfnt_off0000d6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AB 11016 bytes
SHA-256: ff5da81c81b3ed87634c47b4127e7e75203838246e0418b5d17de08ea2185a13

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