Malicious PDF — malware analysis report

Static analysis result for SHA-256 58b72b13acdd6df4…

MALICIOUS

PDF

53.4 KB Created: 2020-10-01 17:32:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c1061d94d36906476bbb345b2933aae6 SHA-1: e98749603a6c907ffa22eb0355351aca3b87e1c4 SHA-256: 58b72b13acdd6df44668f7bb0785e93ea7ef7ae683c1331c180e221eea01a99d
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, which in turn leads to a URL related to Japanese encephalitis. The document body, though heavily obfuscated, contains references to the malicious URL and other benign-looking PDF links, suggesting a link farm or redirection tactic. The ML classifier strongly indicates maliciousness, and the overall structure points to a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/strik?keyword=japanese+encephalitis+adalah+pdf In PDF document text
    • http://files.thecarissafoundation.org/uploads/1/3/2/7/132740424/36c20b53a65724f.pdfIn PDF document text
    • http://zujuge.bcmgaohio.com/uploads/1/3/1/6/131606620/visuxejo_linosipivowon.pdfIn PDF document text
    • http://tovezuz.practicegracenow.com/uploads/1/3/1/6/131607321/tazavoxuve.pdfIn PDF document text
    • http://files.vk5pas.com/uploads/1/3/0/7/130739510/272caf9b33ecfc.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/00255866-8294-4cfb-842f-ad39e5cb6ebc/puwutumedawasomaremedi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78f4e17b-b931-4d63-9742-1c8bd65c0c11/varudakitudapijetuxaju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b305529e-6293-43cd-8b94-b967d182d58e/jotonabufiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da412d2a-4fd6-4607-a295-c9399f697379/solud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdca58d4-3725-4ce3-898f-aa764b8abaa6/68844211833.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0094/7103/files/43763912812.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/1802/8709/files/damapofegafawofenisoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/5740/0994/files/19735909793.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/3270/1859/files/judevo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1061/2635/files/9057354023.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/4068/1379/files/63630416180.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_off00009341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9341 5136 bytes
SHA-256: f60e4971621507fdf34d5c8ea62dbfa224793e85375ae00dd329995c6e80f691
font_01_sfnt_off0000a4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA4BC 10656 bytes
SHA-256: 52897a58385c840837991e89a7e594e66aea40b7d1ce8d3dd799c5ef032401ff

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