Malicious PDF — malware analysis report

Static analysis result for SHA-256 6251b20495dabe35…

MALICIOUS

PDF

104.0 KB Created: 2021-02-24 22:04:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ca57980191636a73a2c1ce1b4e36ebe3 SHA-1: 70c405898e77e5202bc649d93fce4467c13352e9 SHA-256: 6251b20495dabe355566ef0df9381890b0168621e23645e7881b72b292f38dcf
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, many of which point to disposable hosting and are flagged as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were extracted, the presence of numerous suspicious URLs suggests the document's primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/wb?keyword=what%20is%20the%20theme%20of%20ulysses%20and%20the%20sirens PDF link annotation
    • http://pasendapp.online/robin_hood_2018_movie_actress_namev7u8s.pdfIn PDF document text
    • https://cdn.sqhk.co/wujugojuse/iahiig1/nuxuxemuxukaxidakezulixo.pdfIn PDF document text
    • http://nigasheff.xyz/adventure_escape_xmas_killer_chapter_3ofq4k.pdfIn PDF document text
    • http://cparta.moscow/92062766017ed110.pdfIn PDF document text
    • http://nonretloli.site/the_secret_language_of_your_bodyipog8.pdfIn PDF document text
    • http://juvozukatug.66ghz.com/99986514581.pdfIn PDF document text
    • http://strgb2.ru/noredagivokosi6v31y.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://newosanovaf.epizy.com/intake_and_output_practice_sheets.pdfIn PDF document text
    • http://gixarewujedel.atwebpages.com/povukadaxalakinelewut.pdfIn PDF document text
    • http://pasalalu.rf.gd/hindawi_case_reports_in_orthopedics.pdfIn PDF document text
    • http://fojupejededoto.epizy.com/2019_calendar_telugu_free.pdfIn PDF document text
    • http://tuwutexo.onlinewebshop.net/gubukogabeke.pdfIn PDF document text
    • http://xoxemofunox.epizy.com/halfling_monk_character_sheet.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_off00015b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B1D 5260 bytes
SHA-256: a1f2e8c9e2e63c109a9b1fca6fe743cb0eff4b9b8ba48b5447dc033533888268
font_01_sfnt_off00016ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CE9 11344 bytes
SHA-256: 2e82c5971d14d263eed4c4649c6aa43c41239aa6cbf59c86c67c69d1d1cb8310

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