Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b12bd1d461fc237…

MALICIOUS

PDF

38.6 KB Created: 2020-11-07 14:06:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: ddb8e02342a12555ca438f81a4adb663 SHA-1: b64e25a36c4d3e0edf3455624274d78d5cb62dcc SHA-256: 4b12bd1d461fc237c38ab83d62fe98f658e22212ea60028465e1e33053a75531
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://ggtraff.ru/123?keyword=lab+11.2.2.6+cisco+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4445116/normal_5fa3a0f5388e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378857/normal_5f8f98fbc515b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366302/normal_5f888d218bcda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377115/normal_5f904e9289595.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383577/normal_5f9250dc1addc.pdfIn PDF document text
    • https://poxanopa.weebly.com/uploads/1/3/4/3/134380657/wekigupododijusisut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408703/normal_5fa08bfa48c0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376857/normal_5f97b6481bbbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385853/normal_5fa30948e8781.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393033/normal_5f934f0b8fc68.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://tevarew.files.wordpress.com/2020/11/88608638079.pdfIn PDF document text
    • https://zopifigife.files.wordpress.com/2020/11/xodaze.pdfIn PDF document text
    • https://mutozofe.files.wordpress.com/2020/11/65548376527.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_off0000578f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x578F 5304 bytes
SHA-256: a58344c5b3ab1c7a35697aa7dc67fe1a05a8aa28101373dcbb51eb58615984f6
font_01_sfnt_off000069ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69CA 10836 bytes
SHA-256: d85344c453ca43806564b43b6e4457ad36738c7ca57f7521930f33d8e27ca135