Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd8e05f17ba363a5…

MALICIOUS

PDF

76.7 KB Created: 2021-03-23 19:12:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 67003c0c009695469d934245b9ddc7a3 SHA-1: 0883948e475e55b561d61ad71997e568f8999a5b SHA-256: fd8e05f17ba363a550e540214cf9b4ee7bb64f71c98349581a5c3c658534fb20
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous external links, including a prominent redirector URL, suggesting it is part of an SEO link farm or a phishing campaign. The embedded content, though heavily obfuscated, likely serves to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://zajinet.ru/wix?keyword=one+piece+capitulos+wikipedia PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450417/normal_5fdb3f53b484f.pdfIn PDF document text
    • http://xebupado.mypressonline.com/catecismo_jovem_da_igreja_catlica.pdfIn PDF document text
    • http://pazujiz.mygamesonline.org/andrew_ng_deep_learning.pdfIn PDF document text
    • http://gamukanemafutu.mywebcommunity.org/5062436138.pdfIn PDF document text
    • http://nevinidonet.mywebcommunity.org/margaritaville_machine_key_west.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453118/normal_604182765c2f2.pdfIn PDF document text
    • http://mailedflkf.site/11028619588e9u5i.pdfIn PDF document text
    • http://midikakuvekume.mywebcommunity.org/59329151717.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bokofapig/55172198800.pdfIn PDF document text
    • http://limufij.myartsonline.com/2467079282.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/34745234991.pdfIn PDF document text
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_c19bca8c7c9a4a8dab9114e1539c2f63.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kujapomib/vivaf.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/42497595001.pdfIn PDF document text
    • https://f2f8a3c9-3ea7-4a25-b7e2-3e2749f32899.filesusr.com/ugd/f0e51d_1bc6a5a3a58543c2b9ff8b7830978d5f.pdf?index=trueIn PDF document text
    • https://ecf8b3bd-8201-449f-a39c-156acd88681e.filesusr.com/ugd/97634b_d65a113141c94d59bcf33be4ab1f9922.pdf?index=trueIn 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 5

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC36 4608 bytes
SHA-256: 4f0d578bb818b425159a1e94a243b3d2b5d525e315106410fe4e54f9e94426dc
font_01_sfnt_off0000ec85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC85 5156 bytes
SHA-256: 45425fc92da344ec81c08347926d88600fbcc4da9aa1b5204268b56331e8850d
font_02_sfnt_off0000fe32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE32 11864 bytes
SHA-256: f19afb8d1edf958faa8e38fc50a12ac5a4d4fe046d3265f919506bea46b4afbf

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