Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7700820fcd97cda…

MALICIOUS

PDF

68.8 KB Created: 2021-05-16 04:26:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c5a8d94136f9619cfb789f8076408361 SHA-1: 2e99d26a72066afa7d61333c92c89f0027a5e170 SHA-256: a7700820fcd97cdae282a7719bd8d66d5ffbda095a0cf96bfb50026e629a3dd0
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://botokaw.ru/strik?utm_term=baofeng+uv5r+plus+amazon PDF link annotation
    • http://idealslimitaly.site/40554232069opzl0.pdfIn PDF document text
    • https://cdn.sqhk.co/pevejotomoma/eihjAht/wujusimufatogumudizinopum.pdfIn PDF document text
    • https://cdn.sqhk.co/wusezofetib/bwL74Gg/82731457060.pdfIn PDF document text
    • http://rusherx.studio/what_is_a_rare_genetic_disorder26irj.pdfIn PDF document text
    • http://golden-bridge.pro/luredasiresezeravapitepjy7s.pdfIn PDF document text
    • http://brandframeb.com/mp4_movies_download_2015_bollywoodwr6jj.pdfIn PDF document text
    • http://trafikcezaodebayisi.com/what_are_the_navy_pt_standardskgr9d.pdfIn PDF document text
    • http://storeyou.store/dolls_house_directdub9x.pdfIn PDF document text
    • https://cdn.sqhk.co/bitijude/aQ8c3ja/mikukotenavoraravugex.pdfIn PDF document text
    • http://pe50off.pro/cie_a_level_biology_questions_by_topic8ztqe.pdfIn PDF document text
    • http://getbuiss.online/zemaximutidaswbr67.pdfIn PDF document text
    • http://idealslimitaly-ufficiale.site/1756_enbt_firmware_upgradevcqrj.pdfIn PDF document text
    • https://cdn.sqhk.co/bobavijiwoba/i4ibjgB/ninja_dash_run_mod_apk_happymod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://noratev.myartsonline.com/saneraxumifazivo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9715268f-0f9d-489e-9d02-703061e214d0/gipirokexejatina.pdfIn PDF document text
    • http://pozajuw.atwebpages.com/principle_centered_leadership_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0219861a-09ca-4193-995a-2fbb4d352f49/24158836774.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/587b49d7-e561-47c7-9727-af42374ea3d3/how_much_does_a_design_engineer_make_an_hour.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60e5a3cb-e54f-448f-b381-37a66fe0d063/83714081615.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_off0000ce18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE18 5504 bytes
SHA-256: 72d7c5c8859b92fefe5cce0755e841c6fc7ddae11a9bc7ee2b2ac4532c121ddf
font_01_sfnt_off0000e0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D5 11572 bytes
SHA-256: 03583987943b9b0240f3908dd5d75588f587d7cf5687122c1d0ce538d64e95f6

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