Malicious PDF — malware analysis report

Static analysis result for SHA-256 c53bb8691b0b5cb7…

MALICIOUS

PDF

60.0 KB Created: 2020-11-07 07:10:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 8a7e665310408874328fbc5a88588720 SHA-1: 296b9477ccb980d2d8ee23179ba62de9b409c952 SHA-256: c53bb8691b0b5cb78d1c286e85da7634762306aceb6a8327dc4606750393bd6f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://trafffe.ru/123?keyword=gta+5+online+money+hack+no+survey+2019+ps4 PDF link annotation
    • https://rikidunojig.weebly.com/uploads/1/3/4/4/134488605/2173822.pdfIn PDF document text
    • https://gobumireg.weebly.com/uploads/1/3/1/3/131383916/d3aa1f56b283dd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369524/normal_5f990fe143093.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366340/normal_5f8721ca2d555.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/a6586159-a3a8-4fc4-9ed1-52f58c39ffb7/limexivirufipirojafun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/216fe373-70d6-4f3a-8449-0318b5461aa9/jetech_h0782_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4101c5e-c6ca-4fad-9602-26f55fe25207/cssbb_primer_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8564859b-d320-4a2b-ad45-0a57c986bfb5/voxavifuwiwivan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7de3001e-f539-4acc-9c10-a71fddb4171c/force_powers_star_wars_saga_edition.pdfIn PDF document text
    • https://xexagaze.files.wordpress.com/2020/11/47684800467.pdfIn PDF document text
    • https://fidunonip.files.wordpress.com/2020/11/madelizopididam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82de4183-4d2a-4d2d-be0e-b9ebaa9ba5ab/list_of_magic_elemental_powers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32f15fd2-40ee-4aff-8a8f-0a09d921491b/acc_math_1342.pdfIn PDF document text
    • https://nijubar.files.wordpress.com/2020/11/xirodimugopuviguji.pdfIn PDF document text
    • https://tilidefixof.files.wordpress.com/2020/11/lakejovimovupegenobi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ade03901-f1e2-45bc-a6dc-7ab42d34253c/36450261916.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d85987de-f0b2-40b6-a83b-0d214d0fb5a7/wusesiramo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68ce9625-e16a-44b2-9a91-51acf5bbe228/adobe_photoshop_elements_10_free_dow.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA944 6124 bytes
SHA-256: b893d4dc997182a65708b75f443254e424742acf9db3d9dd53e2168c75666b61
font_01_sfnt_off0000be0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE0C 10800 bytes
SHA-256: d4434707aff8ed700258b673e11f9e0ae25bf06864549746f7c900e0b031737d

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