Malicious PDF — malware analysis report

Static analysis result for SHA-256 28569432ddfd79c9…

MALICIOUS

PDF

42.9 KB Created: 2020-11-05 03:15:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2022-06-20
MD5: 8d34b06ccb797151b6bcd7917a5c004c SHA-1: 45c8a8038418d94c18b1710efaf418eda6ad7b4e SHA-256: 28569432ddfd79c98223416c01d9df84e739af2c0d4c9de277829cd6efedfd38
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/aws?keyword=phoenix+craigslist+protest+jobs In PDF document text
    • https://cdn-cms.f-static.net/uploads/4385862/normal_5f9ebeb407238.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368962/normal_5f8b96d1b5d3d.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/zewum.pdfIn PDF document text
    • https://jubunukaf.weebly.com/uploads/1/3/1/4/131483214/dumajapukixibi-kobifel-winimoletuso-radat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365636/normal_5f8cb60d267a6.pdfIn PDF document text
    • https://wefejakero.weebly.com/uploads/1/3/0/8/130814310/wapudotuwor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376854/normal_5f8d5c7dacccd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468537/normal_5fa33e916c0d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369182/normal_5f897db5bca0b.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/cbdc9a8d-c561-40c2-9210-9c88a51dcf82/17061991860.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/kivavotiliragepuxetixawut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccd13609-909d-4bf1-bb2a-40dc1dedc5ec/85163395723.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/broiler_chicken_business_plan.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_off0000647a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x647A 5480 bytes
SHA-256: 2b6b10867e02bcca4b4d55868ca7c3a92aecdbf2fc8aaa3ac466fdfebbe8fc3f
font_01_sfnt_off00007720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7720 11236 bytes
SHA-256: 2047cb38e1daf5a2dbce33f98944a45308b64ea17e9902c272ef6682386a53ee