Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e94887e278cb736…

MALICIOUS

PDF

52.0 KB Created: 2020-11-08 12:08:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e96edead74aa6c5cae7dedda034f53cf SHA-1: d81264ab2f7d8a48bcfefad059aaedd1ea292320 SHA-256: 5e94887e278cb7361e5cc654e997f0c0ce2785e7762d439a433f81642cf72d35
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://traffking.ru/aws?keyword=ultimate+reenergizing+protocol+review PDF link annotation
    • https://vajibenutiw.weebly.com/uploads/1/3/4/4/134487234/zuvozusew-fakagirew-sokopopoj-mizubamadopew.pdfIn PDF document text
    • https://faxipanonuk.weebly.com/uploads/1/3/4/3/134352952/7316178.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/bamudepekepa_setumazowido.pdfIn PDF document text
    • https://suzilevovovo.weebly.com/uploads/1/3/4/3/134310132/kofewadudujuxuxowir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://lakorit.files.wordpress.com/2020/11/nogerujafun.pdfIn PDF document text
    • https://mutozofe.files.wordpress.com/2020/11/65548376527.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5b386c9-12b7-4224-9e37-0326f694e6e3/terraria_free_apk_full_game.pdfIn PDF document text
    • https://zugipokojer.files.wordpress.com/2020/11/89145648166.pdfIn PDF document text
    • https://vogubok.files.wordpress.com/2020/11/jsus_verbe_de_dieu_partition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e132d4c-d803-4b44-819a-0bbdf0384bc4/fufolapi.pdfIn PDF document text
    • https://tilidefixof.files.wordpress.com/2020/11/pursonic_cleaning_robot_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e27199d3-859f-442f-b7dc-dc70fa202ffe/narra_tree_origin.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_off00008d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D06 5268 bytes
SHA-256: 4224ef558bc1627ba6848123efae6e9265d2ea44f2f3c897e71d73290cb3acd9
font_01_sfnt_off00009ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9EF7 10520 bytes
SHA-256: c6f731a5254876bf32e711a434d32f666fd0d0ccc66ec2ded7b624efaac55485

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