Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcb320521a1a8abe…

MALICIOUS

PDF

46.2 KB Created: 2020-11-07 08:10:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 70f49d3c76d742985d4de7d9d4fe8056 SHA-1: dc5d4df50d2c05d055bba86f1ed0d23ad431cd37 SHA-256: fcb320521a1a8abe15f48c9641a2fa0f55b848e1fa8f0d87a2dc871ebe0cb431
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO spam campaign. The document body includes a URL that mimics a search query, further supporting this. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent to redirect users to potentially harmful content.

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://trafficel.ru/aws?keyword=best+magic+items+for+clerics+5e PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427526/normal_5f981daf79519.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374682/normal_5f9bed4a0efb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408475/normal_5f987c7c67892.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wajibile/core_questions_in_philosophy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6eefee28-4d5c-4dcc-b9ff-e6b274b39939/lonuzisuxisesafepesogi.pdfIn PDF document text
    • https://wuzosipik.files.wordpress.com/2020/11/2368023389.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/126b5b45-7817-440b-9b3f-700e3c61b2d4/20205465511.pdfIn PDF document text
    • https://vabavoresadi.files.wordpress.com/2020/11/debewasomogoro.pdfIn PDF document text
    • https://dojofenuf.files.wordpress.com/2020/11/xixeludeposixalitikada.pdfIn PDF document text
    • https://komipisi.files.wordpress.com/2020/11/72772019384.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/holmes_blizzard_fan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35309b79-14f7-4d59-913b-c16a66e4b6bd/just_build_lol_unblocked_games_88.pdfIn PDF document text
    • https://teviwuder.files.wordpress.com/2020/11/bobes.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_off000075c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75C2 5372 bytes
SHA-256: 7e9a65c2d66fe92a26e38e8ba5b8c003f22fb54423c013a7df2fe1c0136821f8
font_01_sfnt_off000087f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87F5 10560 bytes
SHA-256: e2bdb00c99ebde670f00f2eb1c07fafa45205fab5fc7ce417e7600c2693d10b3

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