Malicious PDF — malware analysis report

Static analysis result for SHA-256 4563b5f9e3a5b9cd…

MALICIOUS

PDF

75.1 KB Created: 2021-02-22 13:45:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ee793f9bbdef24b174c057468b6b45a6 SHA-1: b49ef95748ffe098f762f0429ce13c6486385904 SHA-256: 4563b5f9e3a5b9cd466a55fa6a767fca79a1df89ea0aaf40cebd804c8b34467c
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains numerous external links, many of which are part of an SEO link farm designed to redirect users. The primary lure appears to be a search result for "how to delete messages on motorola cordless phone", which redirects to a URL that likely hosts a phishing page or a second-stage malware download. The ML classifier strongly indicated maliciousness, and the PDF structure with mass external links supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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/123?utm_term=how+to+delete+messages+on+motorola+cordless+phone PDF link annotation
    • https://cdn.sqhk.co/xovujiroveg/UidPhdZ/38172259268.pdfIn PDF document text
    • https://zodixezujiz.weebly.com/uploads/1/3/5/3/135345824/jotidow_xejefu_kovetiju_nuniwilexenatom.pdfIn PDF document text
    • https://radugimexeb.weebly.com/uploads/1/3/4/8/134880062/vijoferiza_bijuridafuwov_papigafi.pdfIn PDF document text
    • http://ribuvesigofozeg.22web.org/wow_vanilla_bis_guide.pdfIn PDF document text
    • https://lalinixew.weebly.com/uploads/1/3/4/2/134265361/5244328f.pdfIn PDF document text
    • https://cdn.sqhk.co/jesovolavig/3iamsgi/tofatodapojezutuzek.pdfIn PDF document text
    • https://rowegodidevonu.weebly.com/uploads/1/3/4/4/134468430/kujox_febanojera_kovale.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wokebusaxefani.epizy.com/yamaha_clavinova_clp-_120_service_manual.pdfIn PDF document text
    • http://lisiguzaxupego.epizy.com/teleperexerogojikupupe.pdfIn PDF document text
    • http://toramowajo.epizy.com/basel_iii_bis.pdfIn PDF document text
    • https://s3.amazonaws.com/nafamaragisek/gebuwenijowovakuru.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/wekutudusa.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/tirotelapesirod.pdfIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/jozawewulosujate.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_off0000e7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B2 5540 bytes
SHA-256: 8ea666e0533270ef1376f649b4a4a33e98dce19308fc2a58caeb7c1ab8c7f54a
font_01_sfnt_off0000fa6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6E 10664 bytes
SHA-256: a68a9927b5b83abc83087219c83ea8be17ec0375275fa116164ad0bd03825888

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