Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee549f1371fb33d8…

MALICIOUS

PDF

77.0 KB Created: 2021-03-17 05:05:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 2cf8658391d244a82fcea95cf889533b SHA-1: deec18f574c1d96271c2437fa8617a0df8760b17 SHA-256: ee549f1371fb33d8b50077837c1cb2d5e2c0a9557a527c014139f0fa69ab0a10
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/award?keyword=botulinum+toxin+in+facial+rejuvenation+pdf PDF link annotation
    • http://lomigakorak.getenjoyment.net/timug.pdfIn PDF document text
    • https://menesifewo.weebly.com/uploads/1/3/0/8/130814293/vuzenudi.pdfIn PDF document text
    • https://cdn.sqhk.co/pufowuvikij/ziirFgd/3205080790.pdfIn PDF document text
    • http://vajukadezazi.getenjoyment.net/power_cooker_xl_chicken_breast_recipes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447467/normal_5ff67ec80dda3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460231/normal_60053b1d5d0da.pdfIn PDF document text
    • https://cdn.sqhk.co/zeburozupax/gjYUb3t/61605075495.pdfIn PDF document text
    • https://cdn.sqhk.co/lorotukogof/ictha59/pusezajaziraf.pdfIn PDF document text
    • https://cdn.sqhk.co/koxajavu/cgchdig/ps4_remote_play_laptop.pdfIn PDF document text
    • https://cdn.sqhk.co/fenozidu/JlgKHhg/three_kingdoms_overlord_guide.pdfIn PDF document text
    • https://filukekab.weebly.com/uploads/1/3/4/4/134478490/sabugev_salok_fadajabu.pdfIn PDF document text
    • http://dotekebenutedex.scienceontheweb.net/table_tag_in_html_with_all_attributes.pdfIn PDF document text
    • https://vurerabekude.weebly.com/uploads/1/3/4/4/134493837/xodagasepab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419195/normal_5fdeab9c515d3.pdfIn PDF document text
    • https://vixagudidiw.weebly.com/uploads/1/3/0/7/130775505/9c195acee.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/781c9f77-bac5-4bf5-95d1-3c09655b1b71/panasonic_hvx200_xtreme_fisheye.pdfIn PDF document text
    • https://5a4e7950-e122-4b3c-9cf7-894e7f5b1216.filesusr.com/ugd/76aeb6_467f6fbd49b24729946ef4eba9ca8d9c.pdf?index=trueIn PDF document text
    • https://d6504552-49b0-4b7d-b1ff-94f9e1082b83.filesusr.com/ugd/1f0558_8acd8cd176214c048bfe7c13966fd1bd.pdf?index=trueIn PDF document text
    • https://dacf5b84-f80e-4bd8-bb7f-22aad20a1cd8.filesusr.com/ugd/285be4_d80f544b280a4d4ca208e940dcba1f07.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/180f4e76-1023-4f27-ac5a-1307b46fffed/19912124111.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_off0000f018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF018 5376 bytes
SHA-256: e26b499372343636c626a981b57217c59e98cf0ce02c1a94d20b55a158e7411c
font_01_sfnt_off0001025b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025B 10616 bytes
SHA-256: 9b9c40b7d76c49aaacaf14db80a8bd5aae5b7985fd75ceba2976869d63559ba3

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