Malicious PDF — malware analysis report

Static analysis result for SHA-256 8af180e24e116afd…

MALICIOUS

PDF

74.1 KB Created: 2021-03-07 12:08:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 221478f51f36facc84560f7bcabdf8b6 SHA-1: 10ab84c298f7edac61087a6e73a38767c4ed8840 SHA-256: 8af180e24e116afdd9f8d584542b1c9a647a444500f1b9f4507ae36d6aea89cd
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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/aws?utm_term=interior+decorating+software+for+mac
    • http://nejevefivi.mypressonline.com/45777341645.pdf
    • https://jujizifij.weebly.com/uploads/1/3/4/3/134309807/duvobidod.pdf
    • https://ropaligezavizaf.weebly.com/uploads/1/3/5/9/135962070/mitop.pdf
    • https://notaxivarem.weebly.com/uploads/1/3/4/6/134633458/wigenajenawilemu.pdf
    • http://fekevopimibun.sportsontheweb.net/32761122143.pdf
    • http://ses-paypal.com/how_was_50_shades_of_grey_publishedxgiul.pdf
    • http://famozosivupiwij.sportsontheweb.net/us_stock_market_news_now.pdf
    • http://astrohelp.space/19107856190n28xm.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vidugozu.atwebpages.com/yoga_asanas_names_in_english.pdf
    • http://zejibanunepi.myartsonline.com/56060764981.pdf
    • https://2080fafa-2491-4ac3-8118-a138f33bff34.filesusr.com/ugd/822ecd_841b64065e7345adbb429b64434f726b.pdf?index=true
    • https://9eb5ee95-128e-4115-bcd6-d8db8525ce49.filesusr.com/ugd/9904c2_0ee9a5ed85bc4a02887a91c8b3429ca0.pdf?index=true
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_d7cab16c2fbe488e80f99d9e183240fa.pdf?index=true
    • https://54570836-76ea-4100-b78f-d1ba4c3cc0d1.filesusr.com/ugd/21ac59_d9f29298c789412a9c41cb3d7bd5cef6.pdf?index=true
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_9068b173e280491f86dc91e3986933a7.pdf?index=true
    • https://c1d61d78-9bae-425c-b347-ee91470fe4f1.filesusr.com/ugd/60933b_e1e6db2791ea45da92e78568e589ccff.pdf?index=true
    • https://15319a82-8c66-4906-b3c2-464277991f2b.filesusr.com/ugd/070acf_f070727d61d64e6fbc4011a55431cdcc.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e590.bin
40f3509d72ce92bef7d37f225b6a7c0c0855df5601ecb903750f49dd4fef112e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE590 5336 bytes
font_01_sfnt_off0000f7b7.bin
706380d78c717e34faa9b66877361a83aa23a583ea097d24d2f0bad45f1e0404		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B7 10580 bytes

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