Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ca5aefb351345a…

MALICIOUS

PDF

40.8 KB Created: 2020-11-05 23:52:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-11
MD5: 9d8ccae5c3d9242d9b92e4b2e665cc5b SHA-1: 81fa2cf8c6be6c0c9d3be75f957733a4f3a4df73 SHA-256: 38ca5aefb351345a854d42d2d439ead20f913e78e665e9dd874d98a0ef5531d5
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://traffset.ru/123?keyword=java+the+complete+reference+11th+edition+pdf PDF link annotation
    • https://mefinijusigoti.weebly.com/uploads/1/3/4/4/134499215/31accb6a8.pdfIn PDF document text
    • https://tanifovekula.weebly.com/uploads/1/3/1/3/131379991/nemogagoponop.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/zakeme.pdfIn PDF document text
    • https://xixunogada.weebly.com/uploads/1/3/4/3/134343035/7545641.pdfIn PDF document text
    • https://wikoriduban.weebly.com/uploads/1/3/4/3/134341401/9683332.pdfIn PDF document text
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/xexudagozoje.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/4c96174c-151d-4345-842c-c7bf23b1a2ab/crawling_hand_rs3_locations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83a2fca3-b0f2-44d3-bae8-0f232a41ac43/9458258878.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0357d010-5806-4607-b8da-a3b17157ae67/pabekivexarekakuna.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb8f0994-2752-47c0-8c1c-fdbdaf40d38d/disebidetekurabiwot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3aadc282-6ae7-4b1d-af54-2f7e7c2b6e57/13408745128.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/176b5511-01b0-4b60-bdf1-0628d0398adc/hunter_x_hunter_anime_arcs.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_off00005963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5963 5316 bytes
SHA-256: 1cc4bc955e735e06fb61bb0804ce9df7ed83ab23fc2114dfdb509324c5c44592
font_01_sfnt_off00006b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B5F 13688 bytes
SHA-256: d4c1db6c96e8bbd3443c840cc240f54ea384af04667ff9a57d8accbb807df3ab

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