Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca8c2495edc85c10…

MALICIOUS

PDF

38.4 KB Created: 2020-11-09 01:57:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2022-06-20
MD5: 23dbf0f1dc52aea7fb273b17961aaaa0 SHA-1: 2970a5856fbb31edc94c4a989b2f99b6a590bdf1 SHA-256: ca8c2495edc85c1029555660a29aaaceec5cefa17e5db85a6c7c02c01dc875e3
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/aws?keyword=8+keys+of+excellence+posters In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374175/normal_5f8abaf5e3fe4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366961/normal_5f910d554c460.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465400/normal_5fa6c235f035b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454803/normal_5fa876c421c2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374835/normal_5f8c182f86c34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365582/normal_5f9c154c860c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416675/normal_5f95484f9c5fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421787/normal_5fa883fb42ee6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410211/normal_5fa86cdbeff46.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://kovipuwixo.files.wordpress.com/2020/11/retowakeborokulojukoz.pdfIn PDF document text
    • https://delogifelet.files.wordpress.com/2020/11/baviv.pdfIn PDF document text
    • https://dapiwifi.files.wordpress.com/2020/11/faux_calligraphy_worksheets.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_off00004a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A48 4872 bytes
SHA-256: 096291108ae96447a493386bc0055ea99f419a36b550e25c698e2dad3f9bdfcb
font_01_sfnt_off00005af2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AF2 10548 bytes
SHA-256: 943a7e72bcde8e1181bd3691c5d32e18b42d3ff516babfbf603e81c973265d4a
font_02_sfnt_off00007f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F04 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c