Malicious PDF — malware analysis report

Static analysis result for SHA-256 08b984db5aae2202…

MALICIOUS

PDF

74.8 KB Created: 2021-03-10 00:33:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 45a23310b137b598844c5dde80e04aa6 SHA-1: 56db704863e8677f62e4c0f91a54e6ca8db35984 SHA-256: 08b984db5aae2202eafc8998a733b30eccbaf61f7524f7eb35bbf3f9f0d45880
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-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://fokemale.ru/123?utm_term=diferen%25C3%25A7a+entre+tumor+benigno+e+maligno+pdf PDF link annotation
    • http://sirefuwodinex.iblogger.org/45211875318.pdfIn PDF document text
    • http://domavera.ru/kafifypqo9.pdfIn PDF document text
    • http://rujewazaxijaza.sportsontheweb.net/conjuntivitis_bacteriana.pdfIn PDF document text
    • http://nely.xyz/50384851334fezbz.pdfIn PDF document text
    • http://vugivanasidej.22web.org/lexham_hebrew_english_interlinear_bible.pdfIn PDF document text
    • http://kopuvimu.scienceontheweb.net/kowujoliji.pdfIn PDF document text
    • http://streichpack.online/55853544842arlep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://totiwofosu.epizy.com/sql_server_2019_licensing_guide.pdfIn PDF document text
    • http://xotonibipined.rf.gd/google_sheets_funnel_chart_template.pdfIn PDF document text
    • http://gofosuxubajo.epizy.com/2012_toyota_highlander_limited_consumer_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/061a6720-38b1-435a-8f24-43db6f3e1261/78408599357.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03ed95b3-d5d2-40c5-925d-17fb68435529/funciones_del_jefe_del_departamento_de_alimentos_y_bebidas.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/manawidol.pdfIn PDF document text
    • https://4f0754e2-f0c4-47db-826b-83042027646c.filesusr.com/ugd/7a11b0_8fae8a8a04274ff2a3ee9d02a00eb60b.pdf?index=trueIn PDF document text
    • https://6e8b94c7-278c-4a65-9c30-8d61c93a8f31.filesusr.com/ugd/9ff9b8_83710f0824ff4aa9a48e19ac0ceb79b6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kakef/514360157.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_off0000e3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DD 5504 bytes
SHA-256: 93ebe1587b10624aa24c8b9c6af8c58d64ec2efcec5da0ab07fd2ef6e146ed3d
font_01_sfnt_off0000f684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF684 12156 bytes
SHA-256: c262fd0f17c1a89d1413c5c9776eca618845d72caa918e249044e246ec8d6b23

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