Malicious PDF — malware analysis report

Static analysis result for SHA-256 c08fc579436a0e20…

MALICIOUS

PDF

119.7 KB Created: 2021-03-25 00:41:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 7ded416b538bfff1f94e1a8d50842a90 SHA-1: 264051521070c1ab0856a4ddac1858975dc0575e SHA-256: c08fc579436a0e20df3ab908544123cd8055aff709f89d094d18199d2ed7941e
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to SEO-optimized PDF documents, suggesting a link farm or redirection scheme. One prominent URL, https://jacksth.ru/wix?keyword=google+usa+site+search, is identified as a redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/wix?keyword=google+usa+site+search PDF link annotation
    • http://nibelv.xyz/3d_basketball_hoop3yup1.pdfIn PDF document text
    • http://pixunune.sportsontheweb.net/all_mobile_company_name_list_in_world.pdfIn PDF document text
    • https://basedupapopulow.weebly.com/uploads/1/3/4/3/134344364/nekuwepo_mososurewizewen_finagimorewor_kisefutik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389568/normal_603bdd908c229.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503767/normal_5ff7e8ddedf82.pdfIn PDF document text
    • https://vevinobe.weebly.com/uploads/1/3/4/4/134487659/bosuvabofitefe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383918/normal_60290d45d1d7b.pdfIn PDF document text
    • https://nonujokos.weebly.com/uploads/1/3/0/7/130775252/3f85b28.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393625/normal_5ffac0e9039ac.pdfIn PDF document text
    • http://opt05.ru/470634372680gimc.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/polojuliragam/eat_what_you_watch_barnes_and_noble.pdfIn PDF document text
    • https://s3.amazonaws.com/tinezedu/76004627132.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/drug_trafficking_in_colombia_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f426b469-732a-4ee2-9d59-f891ecc2553e/how_is_wpm_calculated.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/99039316960.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08092fd4-af95-498e-9ca0-444a112c128c/wafijekisafaj.pdfIn PDF document text
    • http://xologikaju.atwebpages.com/era_mesozoica_caracteristicas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/683a6845-1115-4eef-9159-ff6309fb5188/zukapijomebibuparej.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/facebook_touch_site_android.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_off000198c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198C8 5092 bytes
SHA-256: 64f08bd4a3d1c07998e61d193633ea8054e4e69d676bfeb45da031701286489d
font_01_sfnt_off0001aa18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA18 11684 bytes
SHA-256: f1a0cf273d1586d0f0fa6884fd0fa0e94d2cf99929e6db066ff3295c2c7d04f9

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