Malicious PDF — malware analysis report

Static analysis result for SHA-256 798db40ff82af26e…

MALICIOUS

PDF

36.5 KB Created: 2020-10-29 14:58:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 9b0daa79c2202d118f84ea5b7a62b78a SHA-1: 65757291e31745c9f7351deb652ed7d7c1c99ad3 SHA-256: 798db40ff82af26e44a1b81fd55aeee89a95908e2d4142dcb4a74064d0201280
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://ttraff.link/pify?keyword=klein+solution+manual In PDF document text
    • https://gazesomudari.weebly.com/uploads/1/3/1/0/131070071/kidipax-wodotera.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/fovalavodiwelu.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/air_force_paper_x_group.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/fonuzeretew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/6388/9060/files/catholic_intercessory_prayer_examples.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/9510/8000/files/all_clad_slow_cooker_aluminum_insert_replacement.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/5951437925.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/bethena_scott_joplin.pdfIn PDF document text
    • https://s3.amazonaws.com/dojonuta/prescription_for_nutritional_healing_3rd_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/2152/8999/files/online_cv_maker_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/garimuxamifaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4295/8231/files/47587700321.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/0201/7976/files/sibilixamowad.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/92737529475.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000047dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x47DC 4584 bytes
SHA-256: 8663b3448206083faa1d27b45985777ee07ff6fb16d2844e6c46cec4acf2d7e7
font_01_sfnt_off00005759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5759 9212 bytes
SHA-256: 28f9f9cd9f313456163d2ad4af35ecb5b03dd30e380a15816f218044de34e83e
font_02_sfnt_off000076b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76B8 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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