Malicious PDF — malware analysis report

Static analysis result for SHA-256 aec6ba3632b448ee…

MALICIOUS

PDF

73.5 KB Created: 2021-04-04 12:17:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c854056022b46403e776d31d8f4597ed SHA-1: c01218ed07aa127579c95ed6a49526415dd4a902 SHA-256: aec6ba3632b448ee65075389fc0eb6df25fe30303da920c1d467f2b612131b31
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 identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, many of which point to SEO-optimized PDF download sites, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://fokemale.ru/wix?keyword=cosine+ratio+triangle PDF link annotation
    • http://rogojureli.22web.org/bible_free_download_niv.pdfIn PDF document text
    • http://kebitax.22web.org/54455015703.pdfIn PDF document text
    • https://tinozewadewuxa.weebly.com/uploads/1/3/1/3/131398338/xaxekexufemasixowi.pdfIn PDF document text
    • https://fugomunufu.weebly.com/uploads/1/3/4/5/134586131/313c3.pdfIn PDF document text
    • http://rizovog.iblogger.org/warlock_build_guide_5e.pdfIn PDF document text
    • http://rekkerd.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/gabion_wall_design_guide.pdfIn PDF document text
    • https://3cd6846c-369c-4875-9c63-132df726a2dd.filesusr.com/ugd/7ab50f_4872126d85b74d028beb5d2e586ba820.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/595a6df9-366e-47d3-936f-56f69ca3ae13/bezakidavilugopetake.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93982f93-6df2-4629-9a71-86f5b2e8d8a6/samsung_un40j5200af_remote_control.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/metal_gear_2_solid_snake_rom.pdfIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_96cc8843bcac4095871eec30003ebfff.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/67720966172.pdfIn PDF document text
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_e0e792a8bfc6477e890c4725d4439221.pdf?index=trueIn PDF document text
    • http://puvupovologet.rf.gd/basic_electronics_book_bangla.pdfIn PDF document text
    • https://fccd5518-64e1-462d-9dbe-8d8d8a19ca7a.filesusr.com/ugd/eb005d_5d2e54a449bd4aed8e8f8f2a02ae6a8f.pdf?index=trueIn PDF document text
    • http://tegiledo.epizy.com/tirepi.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/castrol_edge_5w30_ll_technical_data_sheet.pdfIn PDF document text
    • http://gemakeruw.epizy.com/29284612571.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_off0000e31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31D 4760 bytes
SHA-256: 7b732a4bfd8049e5c32b068e1c9a0445d0776c245b6343eb5a781c29ddc35ac8
font_01_sfnt_off0000f355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF355 11080 bytes
SHA-256: 6801b9e2801c409f9299c7eb87432a2becae793f9b1887f1ab43147f936311be

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