Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a80a523997d47d…

MALICIOUS

PDF

57.8 KB Created: 2020-11-06 19:38:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b178ebf457c0fb998bd944cc721baa1c SHA-1: e81b6f4619efdf72102b12e44771a7daa0af0925 SHA-256: c5a80a523997d47d2a08c1a389720a996b25ca96e67950a3deb85a075b30de0c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The document body, though heavily obfuscated, contains text related to 'SAS programming in pharmaceutical industry' and a URL, suggesting a lure to attract clicks. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent, possibly to redirect users to malicious sites or for SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://traffset.ru/aws?keyword=sas+programming+in+pharmaceutical+industry PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368972/normal_5f90d68d81b02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410006/normal_5f94768fc0a8a.pdfIn PDF document text
    • https://sagerogokijisoj.weebly.com/uploads/1/3/4/6/134601402/vobudubuwek.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://uploads.strikinglycdn.com/files/e90e4414-9bda-4bc5-bd1a-2d6cf213767e/58957682969.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a4d66d8-52e9-444a-8096-bd5baf46ae6d/76024428927.pdfIn PDF document text
    • https://s3.amazonaws.com/texifaxepag/3507048462.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62a446b8-bea3-42c3-89b7-7118f0a73ef4/a_brief_history_of_thought.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/591a22ee-cb04-4d24-a22c-d1856ffc1536/donapesawivubixos.pdfIn PDF document text
    • https://suvarofora.files.wordpress.com/2020/11/95519257918.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_off000093d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93D4 5576 bytes
SHA-256: 638d47a3b1213e64eb3766935ab7814a5c126ca76e597075ad5e8314974f13cb
font_01_sfnt_off0000a694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA694 10560 bytes
SHA-256: bfa08175ff62ad9c06e2469cb0eef6684498c93a1ff056f1d66dbd02c931eae4
font_02_sfnt_off0000ca98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA98 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c