Malicious PDF — malware analysis report

Static analysis result for SHA-256 903d873e2577dce4…

MALICIOUS

PDF

35.7 KB Created: 2020-10-01 17:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 73440fa8c758cd0e5b6d20040b8199fd SHA-1: 9c84e09a19d28340c241c41dc661fe8a43f6f2f2 SHA-256: 903d873e2577dce4e057776d2268392778a7235301d7f3f149671b712f1466e2
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=atal+pension+yojana+details+in+hindi+pdf+download In PDF document text
    • http://nakusojo.natashanatraj.com/uploads/1/3/1/6/131637352/5471906.pdfIn PDF document text
    • http://ritam.marshallforhouse.org/uploads/1/3/1/3/131379256/jamanotewomesu_dukewux_paduvud_kovawefo.pdfIn PDF document text
    • http://sabuko.toramartialarts.com/uploads/1/3/0/7/130775350/9595502.pdfIn PDF document text
    • http://binotij.talkinghardwood.com/uploads/1/3/0/7/130740118/3983129.pdfIn PDF document text
    • http://gagow.casina-villa.com/uploads/1/3/1/4/131437850/saral.pdfIn PDF document text
    • https://site-1036644.mozfiles.com/files/1036644/xarun.pdfIn PDF document text
    • https://site-1037000.mozfiles.com/files/1037000/funivekawozepubuku.pdfIn PDF document text
    • https://site-1037082.mozfiles.com/files/1037082/72764660560.pdfIn PDF document text
    • https://site-1036759.mozfiles.com/files/1036759/tokebas.pdfIn PDF document text
    • https://site-1037024.mozfiles.com/files/1037024/tibuxenirenisaxiwirenakub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6131/2664/files/wevawova.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/5281/0659/files/area_code_973_scams.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9179/5875/files/galize.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9737/5399/files/dhcr_rent_history.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/055f43e1-aceb-4b74-b254-735d45e60205/negiletapiz.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_off00004f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F8C 5292 bytes
SHA-256: d6ad7816f80d81d4930930fa0d9f7cecf5b6fbe3bd6383302bd804104e0cd09c
font_01_sfnt_off000061aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61AA 9372 bytes
SHA-256: bd53054d96321bf927abdceccbcf7868ff892f1c521020eb10c0effe3fb11e88

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