Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ad814cbecbe9167…

MALICIOUS

PDF

41.2 KB Created: 2020-11-09 10:41:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-15
MD5: 823590a1468bb0c4cb5a46f02bbf687f SHA-1: ab4fd90e078235a0d5b1015934971a76c34a4a49 SHA-256: 2ad814cbecbe9167b39afc1528be1f130daeb81a4d7d782fc838a01a0902166a
126 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=constitution+study+guide+2018 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388177/normal_5fa01bf3d2e3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369651/normal_5fa0813a8d3d9.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/aa38c7ac-57b5-454f-a65c-f62ab33ae512/letters_of_recommendation_for_principals.pdfIn PDF document text
    • https://navisemuzezo.files.wordpress.com/2020/11/fiwiluwavorajotekiwukoda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/360c4d90-43e0-40d0-b87a-3273aaa2a6e9/crop_top_and_pencil_skirt_set_online_india.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/dave_brubeck_time_out.pdfIn PDF document text
    • https://mipibona.files.wordpress.com/2020/11/fojubiraleno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e91c2ea-1556-4294-8245-e18af1ef1a75/52794429750.pdfIn PDF document text
    • https://mavojisog.files.wordpress.com/2020/11/fitaramepesufogopegamiso.pdfIn PDF document text
    • https://feduvojar.files.wordpress.com/2020/11/80038252204.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/pathophysiology_of_heart_disease_6th_edition.pdfIn PDF document text
    • https://vugununamo.files.wordpress.com/2020/11/63558104382.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_off00006264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6264 5180 bytes
SHA-256: 701d1f7761eb1959a146ccec4607c6490e32a66ee9177cbd8dd7bd0ba4da11f2
font_01_sfnt_off00007429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7429 10520 bytes
SHA-256: 9eb30556589504545b84ee31ce56dc4310f0027d23206a5155146fc594e189bf

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