Malicious PDF — malware analysis report

Static analysis result for SHA-256 328c3b68cffb1586…

MALICIOUS

PDF

44.6 KB Created: 2020-09-30 09:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 0dbf41d3a1c1159c6247debb2dd255af SHA-1: 631d268dc3d5c2d067545b136fc1b70cfee56596 SHA-256: 328c3b68cffb1586f48ab9620631249c318c679472337a1b2a987c27109c2ad9
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://ggtraff.ru/strik?keyword=modern+architecture+critical+history+pdf In PDF document text
    • http://bexetuja.ijcai-boom.org/uploads/1/3/2/7/132740264/sanazi_fabuzafesalu_lemufiludozofe_lezowexutu.pdfIn PDF document text
    • http://folegus.sorrentoreview.com/uploads/1/3/1/3/131398225/4797132.pdfIn PDF document text
    • http://files.islandbeautyportland.com/uploads/1/3/0/9/130969243/522dd448b29a.pdfIn PDF document text
    • http://files.restorehopeliberia.org/uploads/1/3/1/4/131407635/5cbbf1d4d783.pdfIn PDF document text
    • http://files.melissahannahcccslp.org/uploads/1/3/2/7/132710592/81c42444.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/ee5339ab-1ca6-4d31-aa0c-fe72605520cd/26762324965.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a48a7f1-814a-4bc1-a575-f8a1a43f9e26/38009858069.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43c271c2-5478-4488-ad0e-75b26b9e5bc8/laludelatijovijiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c806604-86af-43b4-85b0-41d6a7b20002/49073251198.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53d6bee3-bdbf-40ea-ab5d-4f38f1047080/sivuma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90e3e9c6-b417-4548-b799-788c09a23ab7/keluxipetoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5657120c-300f-4a69-9123-268feee510ff/rijumejo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/682a721d-e264-4b8c-84c3-6d19307155c7/wigadogupak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53cd9664-6ae6-4901-8298-1701c348a299/wibulajugabumabaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2569b3bd-7b3c-4901-93e3-a0db9fdaac2d/38236706461.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa722e98-e83a-4fe7-9390-ee120c3c28fa/69620187974.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_off00006694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6694 5352 bytes
SHA-256: c8a97e55cbf6d2ec869ebf28c22c1dd0e5c1af4c4094f52ff87735ba10e46502
font_01_sfnt_off000078d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78D7 13856 bytes
SHA-256: c3adb861d964851a5eaa4dd307a32fc963f8fa1a07b59a69d63e77e8c260f908

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