Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa9bb2e948e9b551…

MALICIOUS

PDF

76.5 KB Created: 2021-03-04 00:43:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 52781d308076f67cf976bbf605283d81 SHA-1: 63b9a0f05604651ff88599fcad062af9be8caf92 SHA-256: aa9bb2e948e9b5514a79efb38a0ffc16bc4716e80a339c4244f185bef3355d62
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://xajibur.ru/strik?utm_term=nancy+mairs+on+being+a+cripple+summary PDF link annotation
    • http://datingdate.site/jemaweretakedetokusezabb1wt.pdfIn PDF document text
    • http://tubujagowip.iblogger.org/fusurugujijategesod.pdfIn PDF document text
    • https://zemedabumudog.weebly.com/uploads/1/3/2/7/132712209/zotonabiromeke.pdfIn PDF document text
    • http://qwonder.space/20988694439hp16l.pdfIn PDF document text
    • http://introdom.ru/divinity_2_swornbreakerbvouh.pdfIn PDF document text
    • http://maykistore.ru/polaroid_tablet_password_recovery19bxf.pdfIn PDF document text
    • http://vakekaninu.iblogger.org/ielts_fever_essay_topics_with_answers.pdfIn PDF document text
    • http://graatorama.space/how_much_do_construction_managers_make_in_californiaqq667.pdfIn PDF document text
    • https://zekigoduse.weebly.com/uploads/1/3/4/3/134336209/3413887.pdfIn PDF document text
    • https://vikenefimedok.weebly.com/uploads/1/3/4/3/134390201/6a1d8b8c251df40.pdfIn PDF document text
    • http://zetomanebegox.iblogger.org/74324208757.pdfIn PDF document text
    • http://bilenilabokadox.22web.org/75379948776.pdfIn PDF document text
    • https://mokitapakajare.weebly.com/uploads/1/3/4/8/134885173/07d7aef1998.pdfIn PDF document text
    • https://junafoxotoroj.weebly.com/uploads/1/3/0/7/130738975/mokazutabob-sedabosilele-sojuwemadi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gulabuj.epizy.com/bawubepefupudujusuwuw.pdfIn PDF document text
    • http://sotivefebaxo.epizy.com/pennsylvania_state_income_tax_form_2019.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_off0000ed68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED68 5464 bytes
SHA-256: 7d0352ace6369e5541cd184a4521f7cd5aeb4fdf87203aa046d4b8b624f46e1e
font_01_sfnt_off0000fff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF4 10768 bytes
SHA-256: 20994b7db8b709f007a63f469aabdd96b532e9ad2babaccf3ae36418657d332a

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