Malicious PDF — malware analysis report

Static analysis result for SHA-256 da1850df45b9d581…

MALICIOUS

PDF

55.0 KB Created: 2020-11-07 05:04:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: c58a0bb2471767af7393cd8da4bce6d1 SHA-1: 569bb66f4401239d18a41c20c7ee37d133f47559 SHA-256: da1850df45b9d5818e22bb339a7e375812c597004d07aa3d53d4c8f2a3a874da
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=fusiform+muscle+fiber PDF link annotation
    • https://gijepeparo.weebly.com/uploads/1/3/4/3/134318767/rutedola-wokilixububemo-garalajiki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388165/normal_5f8f2ef23152a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459784/normal_5fa5d0d115ae9.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/9e3d6cf4-361b-4cf6-b487-d56df3b70e23/36833395669.pdfIn PDF document text
    • https://kixatipu.files.wordpress.com/2020/11/ap_calc_bc_2018_frq_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30d3a866-82e0-4158-b7eb-dd9958308c49/76799141990.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2e05d6c-4f87-446b-931e-42861be17ece/99975784376.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe0172a0-ddc1-4d90-915b-8bfeddbdc514/37251242079.pdfIn PDF document text
    • https://bugowapowufe.files.wordpress.com/2020/11/palifoxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f390165-7377-453e-b8fe-a4cb1ff54881/28322996047.pdfIn PDF document text
    • https://fimalul.files.wordpress.com/2020/11/xenikefeg.pdfIn PDF document text
    • https://xejozowezan.files.wordpress.com/2020/11/gusivazazodasupobuso.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B5B 4912 bytes
SHA-256: b56d9281cdae880d79ee799e9f1a2e2bd8096e76e354c3fa3c90f94b39abf054
font_01_sfnt_off00008bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BFA 2140 bytes
SHA-256: fa98316bad0ee393e4244be63b1d230beb4724cf855be96ad4f2c87a5b302ae2
font_02_sfnt_off000095d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95D4 10432 bytes
SHA-256: 984bed149a335800160ebfcf2728eb0f337528ee9ef2424c38a55e6fe7ab90ee
font_03_sfnt_off0000b9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B4 16236 bytes
SHA-256: d9adced60adaee2d722b200f5f7cabf9ae27795f468d64929b4e52e5cbe77ee8

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