Malicious PDF — malware analysis report

Static analysis result for SHA-256 d55813b74530f669…

MALICIOUS

PDF

59.0 KB Created: 2020-10-05 23:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: f6c19073d6941c1450648d966370148b SHA-1: 5a5fff97d2136a8d2a0ba6a2df1386e0b7f048b9 SHA-256: d55813b74530f66979e39aa400807841601179fdf41593fefcbd60f95471015c
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/pify?keyword=5-10-5+fertilizer+for+tomatoes In PDF document text
    • http://denokos.balancepilatesandmassage.com/uploads/1/3/1/4/131452903/resufelapanoz-ziwefeku-wulijifomowuw-xetuwisade.pdfIn PDF document text
    • http://files.gdshub.com/uploads/1/3/0/7/130739238/kusowiderozexuguxelo.pdfIn PDF document text
    • http://files.southtawton.co.uk/uploads/1/3/1/1/131163590/e5e6a85b9a724c5.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/e9b56d71-1846-4d74-9a23-a5e2b3979519/wefoziwigaxamob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0812b501-757e-4705-844d-e47d9631514d/totizeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a22b538-4c1d-4136-85e4-1dbae80b77b2/76082718870.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5569d54c-2f1a-4243-aa4f-40ba81196b69/26112934258.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69c29e08-bce3-446f-88ad-618395802fc6/rinafaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d62532b-f003-4c67-87c1-654f71159b47/mixewadenonawosutiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22d00c0f-f0ed-4477-875d-04f9b62e67b8/jisokew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ec9426d-5b7e-4370-b851-d5380ba1cf9a/11247173189.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ff249fd-50d1-40eb-8095-a5d22987c47e/51014487238.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1bc23e0-1b1a-4a23-ac34-afca041b994a/risifirijumebujo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d472020-a084-4eac-97cf-03d819ff9047/xesol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bcb9b92-c7aa-40b1-93dc-bc15b86d476e/rutolugu.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_off0000a97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA97A 5220 bytes
SHA-256: d870bf3beeb7cbca1f741f8619d7afc3524eed40d5da1e2ac983fbdb4fb4d7f6
font_01_sfnt_off0000bb38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB38 10372 bytes
SHA-256: 5d9f3a3dbdf8fcee9902b6c8e1fd6b94a006e57c30c21934ded69ce75ae4aace

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