Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccb3eada316ef7c5…

MALICIOUS

PDF

121.8 KB Created: 2021-04-09 17:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 02d4a2fde7b38958df973375a2729267 SHA-1: 3dbee8d5b56d436547c8d8acd78e51ba4bebf0c5 SHA-256: ccb3eada316ef7c5e905d6c2cd0feff73ca89829bc5d7db0924dfb4699cf4891
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file exhibits characteristics of a link farm, containing numerous external links to other PDF documents hosted on various platforms. The primary malicious intent appears to be directing users to potentially harmful content or engaging in SEO manipulation. The ML classifier strongly indicated maliciousness, and the presence of a link to 'resalured.ru' suggests a potential phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://resalured.ru/strik?utm_term=how+much+does+a+peq+15+cost PDF link annotation
    • https://cdn.sqhk.co/gubusase/iajgBRn/cute_puppies_names_boy.pdfIn PDF document text
    • https://jijixedo.weebly.com/uploads/1/3/1/3/131398351/bedivam-damaxim-xibumidefer-metofiruvi.pdfIn PDF document text
    • http://jepisafidezegun.scienceontheweb.net/metal_forming_download.pdfIn PDF document text
    • https://tuvaxijilitug.weebly.com/uploads/1/3/4/6/134668501/d1b7a33f.pdfIn PDF document text
    • https://cdn.sqhk.co/watojosuwana/id3hfhh/mofewobedakola.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b73b9701-b1df-43be-b031-73419f87697c.filesusr.com/ugd/bfbd96_313f1d42abdd48bb97473fe7384dda88.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6be23be6-9976-4d88-936b-b98a685328cd/the_girl_with_the_dragon_tattoo_2011_ending.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b45dafd8-81bc-45e2-ba46-c6fe23cfa1df/31180748219.pdfIn PDF document text
    • https://667abc8f-92ca-45d9-bc9d-789c80a68858.filesusr.com/ugd/dcd78f_c1d6f4ac01e8453da3a2fd7b74fef618.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/11a07f82-0194-40c8-be43-3eca3429d43b/96721608872.pdfIn PDF document text
    • https://5e9c932d-19a8-4d5a-a970-d4bc0bcb832b.filesusr.com/ugd/bae0a0_5b7cf53357fd4e798d09fe317e4221ad.pdf?index=trueIn PDF document text
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_e1b9e866fdaa4959b93e355f8cfccd74.pdf?index=trueIn PDF document text
    • https://704d67de-a0ba-412a-a77d-f8c4cf0d88a3.filesusr.com/ugd/a83d94_340537aea5b24421856fd58798a52e0e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9cdd7c2-69a5-47f4-a116-babbbb2089ba/56430581207.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63eb80bd-8e11-4171-9199-5952973e05e8/debowozarumoxefure.pdfIn PDF document text
    • https://0879403c-3be5-48e4-925f-21334a7d5cfe.filesusr.com/ugd/407fcc_21db1e2dc89b493aa6cf3f0435c94253.pdf?index=trueIn PDF document text
    • http://madigekole.onlinewebshop.net/present_simple_adverbs_of_frequency_worksheet.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_off00019d17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D17 5540 bytes
SHA-256: 2c08491cebc842f5f7855cc349b8e1c130c9bede41ae9cff1bdc7a54187f0e57
font_01_sfnt_off0001afe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AFE2 12332 bytes
SHA-256: 56a8e2b215176db4328aa9a0271fa7b308a75fc0a9aec1533efac6dae0bac0c3