Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e398ec66bb2a90a…

MALICIOUS

PDF

40.4 KB Created: 2020-11-08 08:15:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 9e8631895fe3f98058dd9a822ccf3bf2 SHA-1: 394632de3d0e535e7a88ad8368b397a75b280d38 SHA-256: 5e398ec66bb2a90a4922174156ae3d048d85faa89c93d0163dc543d60ead7c12
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/aws?keyword=benchmark+answer+sheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380070/normal_5f911ff20893b.pdfIn PDF document text
    • https://duroxogudoli.weebly.com/uploads/1/3/4/3/134318703/2cb2c264eb59652.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/damerirazib/memnoch_the_devil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00f15d5c-4e10-4b3e-9f67-50f66201e41b/2176679668.pdfIn PDF document text
    • https://zopovamodutu.files.wordpress.com/2020/11/mifufavagatelajoru.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/dujunenezikem.pdfIn PDF document text
    • https://lusabun.files.wordpress.com/2020/11/xevuvuj.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/79217433186.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/muroj.pdfIn PDF document text
    • https://pavezisetapo.files.wordpress.com/2020/11/como_hacer_monturas_en_minecraft.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_off00005b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B73 5212 bytes
SHA-256: b93e2cbc6c86ddb52a4f973fc323404f9825aa23f7573043b6d14313ea99e899
font_01_sfnt_off00006d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D13 11824 bytes
SHA-256: 4310a7a658ff229fa3867d5984cdc4f3a55a22ce31c8eca76644cbca834f0af5

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