Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a0d094f4fc59e6…

MALICIOUS

PDF

44.5 KB Created: 2020-11-05 22:14:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 29fd111476e38ebf349c49969722792c SHA-1: 54b9c1277cf481177c31d349b7a26a88c040e037 SHA-256: 78a0d094f4fc59e66b5acc36a31693b5ded96f7bd670ee7d9c3b0778ee9f3d01
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffe.ru/aws?keyword=delivering+happiness+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417543/normal_5f9891e7350cc.pdfIn PDF document text
    • https://purusoze.weebly.com/uploads/1/3/4/4/134495244/litegowesokok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372377/normal_5f912097da5c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389353/normal_5f9d1d02b7639.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461770/normal_5fa2da59a68b0.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/kudefem/degirasudipugipiporakapa.pdfIn PDF document text
    • https://s3.amazonaws.com/tekujel/anime_suitable_for_11_year_olds.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/shot_on_goal_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/arrogancia_definicion.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/pojawaludazenat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e20ee969-de5e-4dcf-bfbc-6a6c69b672da/61508469851.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/477280a0-0375-45c9-a769-9335d1d54122/11829926846.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/advanced_english_vocabulary_with_examples.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_off00006455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6455 4960 bytes
SHA-256: dcf8b35ef66985342f86f12e3f82456ce5c385af921acf0741369580bec919c1
font_01_sfnt_off00007521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7521 9948 bytes
SHA-256: b5278508b88c5478aeda2606dba924349cd21867cea1a2d7b33211df51e903a0
font_02_sfnt_off00009747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9747 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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