Malicious PDF — malware analysis report

Static analysis result for SHA-256 d52331aa65d61346…

MALICIOUS

PDF

73.1 KB Created: 2021-03-21 12:01:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a305afaf76b3279bb6a086e66acbb526 SHA-1: 113fb4d7878d77db85960dda0fc310a40d43c641 SHA-256: d52331aa65d61346772d893f56934aa622430dc3f3163f6b139e717e31048622
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of an SEO link farm designed to redirect users to malicious sites. The primary lure, 'Minecraft advent calendar 2020', points to a URL that is part of this redirection scheme. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a phishing or trojan payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://midufefew.ru/wix?keyword=minecraft+advent+calendar+2020 PDF link annotation
    • http://tamakar.xyz/83499616636rt651.pdfIn PDF document text
    • http://lnstagramcopyrightservices.org/michael_talbot_books_in_order5hdi9.pdfIn PDF document text
    • http://visionnew.xyz/didezoyl2bl.pdfIn PDF document text
    • http://free-at.pro/how_to_fill_in_missing_numbers_in_fractionscycwr.pdfIn PDF document text
    • http://life50it.pro/wutesiroxegazezoniniy2vd1.pdfIn PDF document text
    • http://cheapkeys.site/icici_bank_full_information32qve.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_cc1aa70c6af24fb9a1b202b486f6a6f7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jupoti/leicester_city_v_arsenal_match_report.pdfIn PDF document text
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_02129ec8a91e43ea867bb8793ae06a61.pdf?index=trueIn PDF document text
    • https://2c8134a4-d865-4da1-8961-c755d7242105.filesusr.com/ugd/6dcf04_ab8e5c56411049e2a729f513902a528b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kotenu/bovavewixowirojikos.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/toxujivoxojapilesibibix.pdfIn PDF document text
    • https://72dfff08-f6cb-4f5d-aaac-ebe71175d6a6.filesusr.com/ugd/c268f7_a9240e59c3494d43b54f343729892287.pdf?index=trueIn PDF document text
    • https://d38713d8-f9e0-49bf-8e72-3f46774ce551.filesusr.com/ugd/b3faf5_453d8761b13b4db2bbda32f02bd62651.pdf?index=trueIn PDF document text
    • https://f459ab6e-ac57-43ce-b83a-1524846427e4.filesusr.com/ugd/938c70_6a24a91c0d194c43869ab54e073e6d70.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/visiting_card_size_psd_free.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE73 5176 bytes
SHA-256: ccf3e6ac2e1c2dd59e9957d607852f7073d1e8c2b506926896a7fb0b770398c7
font_01_sfnt_off0000f033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF033 11892 bytes
SHA-256: 8bf1daac36da48b5b115b7b12ec3b60b314093f5a9e899dfe2f727f38c8a85eb

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