Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d428236ba0d4e71…

MALICIOUS

PDF

54.3 KB Created: 2020-11-08 22:48:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 912ebecd7ad5e66cfb98ea9933c00cff SHA-1: b305d1a9f869ab514d6a7636419063712303f85b SHA-256: 7d428236ba0d4e71d5f49cb784c1911355918450cffcdedd47ba4edebb4dae97
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://traffking.ru/123?keyword=graphing+trig+functions+practice+with+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4412388/normal_5f9a26ff569be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368487/normal_5f88c6cfbbd9c.pdfIn PDF document text
    • https://nobinetezo.weebly.com/uploads/1/3/0/9/130969761/439493.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368485/normal_5f964adf8b216.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449193/normal_5f9dc57d77529.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404502/normal_5f9a0471712dd.pdfIn PDF document text
    • https://kafasomawupi.weebly.com/uploads/1/3/0/7/130775431/novunagiteg-gedogozop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/the_corner_bookstore_fairport_ny.pdfIn PDF document text
    • https://bovalov.files.wordpress.com/2020/11/mktg_lamb_hair_mcdaniel_7th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af389cdd-b697-4521-a85c-93eb58e47fe8/didajamisitowomosologaxiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92d3f944-33c6-47e1-a855-2aa0e2842011/61648231134.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/pexawewi.pdfIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/86560644613.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_off00009390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9390 5368 bytes
SHA-256: 91a1de5d62f68c0a4dd9fc8b5fc8df32b2a0d7b20521aff637e52f3c99587971
font_01_sfnt_off0000a5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA5E8 11284 bytes
SHA-256: 31a345ad459f652ecec7a041aa542d1b65063b6e8f2cf83fc302679701613014