Malicious PDF — malware analysis report

Static analysis result for SHA-256 b19cded9435312c7…

MALICIOUS

PDF

100.6 KB Created: 2020-11-13 04:53:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: cbd341ec6fd35c09d4f506bb3842d91f SHA-1: 9eb8a9c6530929fd3d8b17f87b37489e0fa4783a SHA-256: b19cded9435312c7198d83acce494801de0433c0655fddbf207da5988334a3f2
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9997

Heuristics 4

  • 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.
  • 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/strik?utm_term=definici%25C3%25B3n+de+diagnostico+situacional+de+salud PDF link annotation
    • https://femevidawivuk.weebly.com/uploads/1/3/1/0/131071063/raguvejexaxep_ratalilofo_xufibadam_pazerarop.pdfIn PDF document text
    • https://vekejuritikoj.weebly.com/uploads/1/3/1/8/131857631/910391.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453908/normal_5faa75f64d661.pdfIn PDF document text
    • https://rewazute.weebly.com/uploads/1/3/4/6/134648352/ralilavoret.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/92d77dc8-6b42-4e8d-8bea-84073ec4537a/principal_coordinates_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/183ef78c-32de-4f82-84fd-38eb2159f8c7/sex_and_the_city_tvdb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6a4fb5e-c4d0-417f-b8fa-b37855a43f1a/70594641837.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc37234f-30b4-4f93-8dd5-e22d093e6fe2/37751615620.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d09a3d80-2ff3-4404-b358-69cd205647d3/7345274229.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5cfc27a-a866-47f6-9451-61dde2ebd1b4/rumeje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d192b130-7c4e-462c-88d4-bb6fbc3c0f25/88998235803.pdfIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/85101917672.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba6ca7fb-c4c0-46ad-b273-b48be6ae7c73/vakibozofitiwoka.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_off00014833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14833 5228 bytes
SHA-256: 417a926ad119970c062040d35474ac6ee5e466d2dda569fe45a22f3c43e1901b
font_01_sfnt_off000159e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159E2 12444 bytes
SHA-256: 862099914ef6bb7b911bbb63f3a1155090bcda41ab3474bf0215a6802dac078c

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