Malicious PDF — malware analysis report

Static analysis result for SHA-256 70421d187e6b0e02…

MALICIOUS

PDF

79.2 KB Created: 2020-12-11 20:53:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: d12f5ee807fef35dd453ef2ccb0eb680 SHA-1: 20921d121d6816396bf612cad912f0608228eacf SHA-256: 70421d187e6b0e024ebc277d9cee9e1f5043f9696636558e1e28125f44ba2736
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing. 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 0.9998

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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/dozafawegikuxoto.pdf.
  • 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/strik?utm_term=ag+molar+mass PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451033/normal_5fad876ea2a11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499660/normal_5fbbcf26b8bbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387933/normal_5fd1d5a27bc05.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/dozafawegikuxoto.pdfIn PDF document text
    • https://pilidikuvitas.weebly.com/uploads/1/3/4/7/134766888/13c0b1eee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380887/normal_5f8de4fbd3273.pdfIn PDF document text
    • https://vonenefanor.weebly.com/uploads/1/3/4/6/134638091/3335983.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367940/normal_5f8b7726ebb92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401540/normal_5fb7f15f167d3.pdfIn PDF document text
    • https://viworisexefu.weebly.com/uploads/1/3/4/8/134885507/2c2bac48.pdfIn PDF document text
    • https://://s.yimg.com/os/creatr-uploaded-images/2020-12/eda9cf20-3baa-11eb-aefd-01ca76f86be6,lgIn 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/47cb090b-54e3-4b4a-9d86-d80aa909aac5/57247988787.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/539b12e6-3a23-4c97-8bb1-8a3dee566d4a/pokemon_shuffle_free_jewels.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea2f7578-e8b3-4aba-aae6-54e64272411f/73191613344.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/870c9903-54d8-4d96-9cfb-e560246830b8/dopenibanokig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c4af736-408e-4ca4-b0c5-41f4f3001d83/44149832675.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE820 2900 bytes
SHA-256: 40ce0bc9b113ef031639604f059b60aa9f1e41b097d60e75bfbf620cccc66306
font_01_sfnt_off0000f264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF264 4996 bytes
SHA-256: 9ea1b2f49572b2e17cda56b787477f7bb06c341e3212da356d07b462c2d93443
font_02_sfnt_off00010348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10348 13904 bytes
SHA-256: fe003572562a85b0620f624b56b0d5a628179b2566087726bba10563d385235d

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