Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cb374e6ac4a7ca2…

MALICIOUS

PDF

41.9 KB Created: 2020-11-08 07:40:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-15
MD5: 35a82cafc0ede25d7815cb14c3dd4c42 SHA-1: 3b662a21c81461c3ac9f4734a87f73166ec87c11 SHA-256: 4cb374e6ac4a7ca2bdaad524f75cac9cd039ab3157afed533523ae78326c60f3
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://traffine.ru/123?keyword=chicago+style+image+citation+example In PDF document text
    • https://zulatikuwa.weebly.com/uploads/1/3/0/7/130776211/abee60c4ffd.pdfIn PDF document text
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/8276185f.pdfIn PDF document text
    • https://pukotegifo.weebly.com/uploads/1/3/0/8/130874060/jamekutodinube-tuwedil-jekowibesefo.pdfIn PDF document text
    • https://woliremokeg.weebly.com/uploads/1/3/4/3/134340334/mevakabudu.pdfIn PDF document text
    • https://siwikuzovusodig.weebly.com/uploads/1/3/4/3/134357046/zusuf.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/divelatoxa/fowudoxuseremoxija.pdfIn PDF document text
    • https://worejuz.files.wordpress.com/2020/11/76349423756.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/unblocked_games_bow_and_arrow.pdfIn PDF document text
    • https://lusabun.files.wordpress.com/2020/11/administracion_financiera_gallagher.pdfIn PDF document text
    • https://janapag.files.wordpress.com/2020/11/misedosapirerepekogozezaj.pdfIn PDF document text
    • https://fepenowiridu.files.wordpress.com/2020/11/65354109678.pdfIn PDF document text
    • https://juxabugu.files.wordpress.com/2020/11/kadiduzi.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/55980664798.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/buyout_agreement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27e826a2-1214-468a-a3ac-7cb4025e9d0c/56666847636.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_off0000647b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x647B 5324 bytes
SHA-256: 3962e47672c3f79b3d538864b2b961a8298a336a695b56a5966b607dad193d71
font_01_sfnt_off00007683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7683 10812 bytes
SHA-256: d63050c7e0792087278309dc3c3de32ac28088a9fd44b367a1518e8e525f5984

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