Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f8b967d439fbed…

MALICIOUS

PDF

46.0 KB Created: 2020-11-07 10:41:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 345d65db5588c1e9b9424f5fe43be141 SHA-1: 437a716aff1a4b8f1a5832d083ad2b70bf0ceb93 SHA-256: 52f8b967d439fbed859ee46cc651a82d5950220fee4a782067c37a9fdf4faec1
126 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The document body and embedded links point to search result pages for unrelated topics, including 'best keyboard app for android 2019', indicating a lure to drive traffic to potentially malicious sites. The ML classifier strongly flagged this PDF as malicious.

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=best+keyboard+app+for+android+2019 PDF link annotation
    • https://vinibakuru.weebly.com/uploads/1/3/4/3/134310820/3400054.pdfIn PDF document text
    • https://redunexodozik.weebly.com/uploads/1/3/0/8/130814050/767975.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382194/normal_5f8c2a7b8336b.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/0bfba025-76cb-4710-b0cd-14d7dfa9d41f/las_mujeres_en_la_segunda_guerra_mun.pdfIn PDF document text
    • https://buxefonatis.files.wordpress.com/2020/11/toronto_notes_2019_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d20901e-9516-4030-a2c6-b4a10658dedd/pirate_ship_tattoo_traditional.pdfIn PDF document text
    • https://mafebono.files.wordpress.com/2020/11/74080264700.pdfIn PDF document text
    • https://fanexose.files.wordpress.com/2020/11/kappa_tv_music_mojo_mp3_malayalam_songs_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e57a7c90-5e1b-47c3-af71-2149e7998255/zejitexafibisizo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8e0f0d3-a7ba-4026-bb34-a965ca6fe2a6/tipos_de_textos_juridicos.pdfIn PDF document text
    • https://xanafegeze.files.wordpress.com/2020/11/munuzaragujilupipazabik.pdfIn PDF document text
    • https://vabavoresadi.files.wordpress.com/2020/11/debewasomogoro.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_off00007353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7353 5840 bytes
SHA-256: a9393da874578e7fb277e883217cd6ce86fbbec81f698dd1a97ada6612b8b0bc
font_01_sfnt_off0000874d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x874D 10524 bytes
SHA-256: b9af6deb36cb80b9a42982a362aaffb4d407b3ceaf5d23490dc6d4e95a8f403f

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