Malicious PDF — malware analysis report

Static analysis result for SHA-256 b32456e22d1b004c…

MALICIOUS

PDF

156.3 KB Created: 2021-02-13 01:26:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3cf8109e241a486cbeea6d25fab2d52d SHA-1: f3f5c12d9167228dc419f02c2620a9cf0fb26873 SHA-256: b32456e22d1b004cef41800be32cf54aa6293b74701a289a9692ce6b19653147
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with many pointing to disposable domains and exhibiting link farm characteristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

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://jottigo.ru/123?utm_term=choujin+sentai+jetman+nes PDF link annotation
    • http://verification-help.business/42468511533w3may.pdfIn PDF document text
    • https://cdn.sqhk.co/dufolatik/igHhjjj/tasty_words_2_answers_level_1.pdfIn PDF document text
    • https://cdn.sqhk.co/gapalagabig/lspigpp/16162401212.pdfIn PDF document text
    • https://cdn.sqhk.co/rosivapixove/ijdV2rP/83766892440.pdfIn PDF document text
    • https://cdn.sqhk.co/kusewupudin/dAR0hfG/fumuxamatovedamoj.pdfIn PDF document text
    • http://healthyforczechrepublic.site/war_of_1812_significance_to_canada0qgx3.pdfIn PDF document text
    • http://workmonster.net/melhor_forma_de_acender_churrasqueira_com_oleo545sb.pdfIn PDF document text
    • http://study-english-04.space/assistir_the_l_word_1_temporada_dublado_e_legendado_online6obbt.pdfIn PDF document text
    • http://tizezs.xyz/oxygen_not_included_advanced_guidegmapr.pdfIn PDF document text
    • https://cdn.sqhk.co/vinasujitupe/ieQThen/trending_tiktok_videos_telugu_app.pdfIn PDF document text
    • http://wordsidepost.top/rush_limbaugh_podcast_youtube3bk1h.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/tasufagijaremo/finisar_ftlf8524p2bnv_datasheet.pdfIn PDF document text
    • http://besuwodusibix.rf.gd/fluke_287_data_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/cafeland_mod_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/70608735354.pdfIn PDF document text
    • https://s3.amazonaws.com/dazemi/kealia_kauai_surf_report.pdfIn PDF document text
    • http://ralakevitodabaj.epizy.com/28683150870.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/78786427764.pdfIn PDF document text
    • http://rulenanevatetid.epizy.com/rhel_6_package.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001cc1e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1CC1E 30224 bytes
SHA-256: 11a3fa03e1e399c0cbc8f74747b08440f4204aa4cbb3aee857fdd7309162b591
font_01_sfnt_off00022ad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22AD8 4780 bytes
SHA-256: 357b2ca08efb1404c53223558212e7a27307d9f7a789ec796f48d82ad311c28c
font_02_sfnt_off00023aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23AED 12216 bytes
SHA-256: 35efc0bc8e3776c148f0f5ebb503071d6ceb2d460b81c53251b6cab8bbf55596

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