Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7f9a692ee861de9…

MALICIOUS

PDF

50.0 KB Created: 2020-10-11 22:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 914c78f936017820af039d790342a04b SHA-1: e2c00e7ca86dcaade22ceb64a0115f49e1b2bc00 SHA-256: f7f9a692ee861de958d4eef61f3cd9fa4e97351c0b0ec779c305212a2b8e2be5
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://cctraff.ru/strik?keyword=bulma+css+tutorial+pdf In PDF document text
    • http://files.jsbasscounseling.com/uploads/1/3/1/3/131378919/nugiregedidipom_pifoxozirapafuw_vosodor.pdfIn PDF document text
    • http://dizona.ralphgraciewalnutcreek.com/uploads/1/3/0/9/130969465/bf4cceb0.pdfIn PDF document text
    • http://files.windowtothewild.org/uploads/1/3/0/7/130776781/bagexusezaf.pdfIn PDF document text
    • http://wikobiget.onelifeforlife.org/uploads/1/3/1/4/131453036/7625369.pdfIn PDF document text
    • http://files.nathandmaki.com/uploads/1/3/1/0/131071063/1438253.pdfIn PDF document text
    • http://nafeg.cloverbands.com/uploads/1/3/2/7/132741181/wiwimejirivuda-gakorepugo-xelisejana.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/083a3b74-b35f-4d9e-a73f-7d357d75b378/86928134057.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97b7b129-0fc0-4486-a616-cbb7ac0862ea/semuzafurorinopinumofe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d03a390-4ad8-4ade-b392-8c79ed2d257f/gasabo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/202d8ba8-3131-4bbf-b927-95a282f0f845/kisofaxixa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4938d799-1d54-435d-8c7c-82e65e189ec0/63351627842.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/562f6d41-6b07-4319-bc88-f828981177d6/10798904061.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d23ab073-44a5-40cf-b554-cd460bd66f3d/kepaf.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65B4 5348 bytes
SHA-256: 6d07f90d92870584722060b22e7f74310c1d97ea4b0a4ba763eeba6ad680c8f3
font_01_sfnt_off000077ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77CA 14128 bytes
SHA-256: 278eeead65cefd28a51b3ec731f29b5c4701c4a6048d41ac10ee0a9334c681e8
font_02_sfnt_off0000a5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA5A7 16336 bytes
SHA-256: e06fba4164ac16c165214f5f4232651daafdc404a58c7e7d1ab12f636b0c6cc1

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