Malicious PDF — malware analysis report

Static analysis result for SHA-256 82d981f437d3123e…

MALICIOUS

PDF

47.3 KB Created: 2020-10-05 08:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: f6dff49aed65a43614c2d75d434c2a6a SHA-1: 6983f2441b82a42ea1a7ea463a14743dd9d42311 SHA-256: 82d981f437d3123e4e26604c152af156acec0c594b95478d72184d471b2d4876
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://gettraff.ru/pify?keyword=geometric+shapes+formulas+pdf In PDF document text
    • http://veripined.shcni.com/uploads/1/3/2/7/132710634/taramisuz.pdfIn PDF document text
    • http://files.careyreidkirkinc.com/uploads/1/3/0/8/130874086/sufeb.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/862460d6-bb21-4069-b92d-42e52751fb88/nasebetoderujagirosawegij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fecec33e-da21-4cbe-bfe2-daed65168edd/98061871498.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62afc955-1edc-4f12-9aee-b8937b1f2aa9/90857177454.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef677709-24b9-48fe-a7bb-dc0e55100551/numuwaragun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a529aae-d873-4bb9-8117-087d05dde586/pasoriritixorofiwirez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05f94db7-ceca-4bf6-a24f-28351ac057c0/29358901516.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcfd106f-165d-40aa-94d4-eac13e1599c9/rixavenofanaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28113313-49c4-4e51-94cc-6804a5865669/12652356351.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30f1730d-1354-4b6f-8c64-6464c095b5b3/musaw.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_off0000675c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x675C 5692 bytes
SHA-256: 08d7ea7155f5a82489129237b3ba81cfccf6e155988584fa1a5749757ac477f7
font_01_sfnt_off00007b1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B1F 5428 bytes
SHA-256: c8c5969d6cfc898fd422e85167ace6806fd18828dcda3e4903dcc5cbc078d431
font_02_sfnt_off00008d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D69 10092 bytes
SHA-256: f0643d311497024ce087e0f3c9b0e2f840fcce5eb1631baa77d38722b95fdcad

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