Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a85915b10753e79…

MALICIOUS

PDF

38.3 KB Created: 2020-10-05 16:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 87f44876867d569776483a6fdd401e9a SHA-1: e6b17423864e0793b15ff4cef3edac29dee4b360 SHA-256: 0a85915b10753e79b2d48b42e799ff88002620e1d368a14b2d679c0fadb69c4b
202 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ggtraff.ru/strik?keyword=printable+multiplication+tables+from+1+to+20 In PDF document text
    • https://site-1043260.mozfiles.com/files/1043260/kitufivujagoze.pdfIn PDF document text
    • https://site-1037033.mozfiles.com/files/1037033/gokadakareligijo.pdfIn PDF document text
    • https://site-1038756.mozfiles.com/files/1038756/92933151884.pdfIn PDF document text
    • http://pevazibin.lcandlepress.com/uploads/1/3/0/7/130776082/deserivum-vajikijirixa.pdfIn PDF document text
    • http://monez.dunnvilleurc.com/uploads/1/3/1/6/131606111/vijobaxamulurubi.pdfIn PDF document text
    • http://files.falmouthfloodinsurance.com/uploads/1/3/1/4/131405977/vupatada-wesig.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/a775cfd6-614f-4a8c-8b70-ba5687fbe2eb/69888063412.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2968a9dc-60fb-457f-aa39-df2c7d5d4695/rukedugij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b14bbd6-95ca-4bfe-95b5-ebee3627de48/nidigezuvegadejuneneru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fb0a538-ace9-4cba-a08f-c41c4138f37a/19765970268.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3daf904-c862-4608-ba20-7093cc5e21bf/kerofofejokikuvuloj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81304a2a-2260-4ad7-9081-b9b82d76ff28/77953388250.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_off00005789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5789 5628 bytes
SHA-256: ee048121f652ad8b986890987337935ee8d2467ea2096672ccbda11ebaa3fa9a
font_01_sfnt_off00006a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A9B 9980 bytes
SHA-256: 5e7f6885adc7ad589b5af0849ded697d34f75390b87f4caa811efff09b3e5c7c

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