Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bcc625a8cd4b501…

MALICIOUS

PDF

48.8 KB Created: 2020-11-09 14:59:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 84d5c2dd2ddeec56dd1cdcb8e89f1f9d SHA-1: d312df22520c662cfeafccf3aeb17a1e7ec59f50 SHA-256: 0bcc625a8cd4b50183f77e7816669a516897ea50f665b0c454681743a26d478d
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. 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 1.0000

Heuristics 4

  • 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.
  • 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://traffking.ru/strik?keyword=system+requirements+lab+detection+desktop+app PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366961/normal_5f956448210d9.pdfIn PDF document text
    • https://wexofele.weebly.com/uploads/1/3/4/6/134632346/5a1f0.pdfIn PDF document text
    • https://mekukirofex.weebly.com/uploads/1/3/4/5/134589797/8727802.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413701/normal_5fa3c153ab196.pdfIn PDF document text
    • https://buvitefano.weebly.com/uploads/1/3/4/1/134131500/kifejesi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403119/normal_5f9c7b6dcc8a1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/damevusom/71364583260.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74bfe5a3-e630-43b4-8d4a-72ed09fc4cbe/dixubasalanagojojekeso.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/universal_genetic_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cbb0dfc-dc9f-49a9-a484-2adf85040e30/12258316178.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94ff5066-c0ea-44aa-a924-f982ccf615b8/balipabunopobeku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/490226b9-9ebd-4f67-b05d-58fe545b30fd/wurth_wow_download.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_off00006e2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E2C 5636 bytes
SHA-256: c1e44d66fbd11429a46d19ed7e3f1661e52171467920d5d998dda3a4ac054243
font_01_sfnt_off00008128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8128 11520 bytes
SHA-256: e84c37cc627aa6050b6367e273127ba708ce821c506e426083a387e0e8b3cfb7
font_02_sfnt_off0000a860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA860 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f