Malicious PDF — malware analysis report

Static analysis result for SHA-256 78b7c793a9eea82d…

MALICIOUS

PDF

77.6 KB Created: 2021-01-05 04:17:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 78957b6f0f5965c6f563d949939a0668 SHA-1: 729b3cb9428f47b4b6ced55a72326b91f61db33c SHA-256: 78b7c793a9eea82da8d3f2a40ad0c48139ddf263025834a4b92406ea657a0017
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO manipulation or to distribute malicious content. The ML classifier strongly flagged this PDF as malicious. One of the extracted URLs, 'https://trafffi.ru/123?utm_term=blue+round+pill+031', is a suspicious domain, while another, 'https://uploads.strikinglycdn.com/files/efe0795a-7c12-49ab-8af7-11fdef8078b6/faxosexafef.pdf', is part of a link farm. The document body is heavily obfuscated, preventing a clear understanding of its direct intent, but the overall structure points to malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/123?utm_term=blue+round+pill+031 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367633/normal_5f8851c83bc40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389085/normal_5f971b0f2ecd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404514/normal_5f92568395ec6.pdfIn PDF document text
    • https://zexunipubu.weebly.com/uploads/1/3/4/8/134877105/vifupagovok.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/efe0795a-7c12-49ab-8af7-11fdef8078b6/faxosexafef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa47d3e4-6c78-4198-8c84-c08086ef88f4/worksheet_intro_to_magnetism_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/65243802258.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/64517520956.pdfIn PDF document text
    • https://s3.amazonaws.com/lotibabakuj/fire_protection_design_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/humphreys_tearoom_trade_study_ethical_issues.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67376972-fc9a-465b-b5a7-e90ad621b5bb/correr_ou_morrer_3.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_off0000e7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FB 4772 bytes
SHA-256: 9a4c32769204db3cf7084c6087fd0a31019930e7cea05ccd685fadb4b254389c
font_01_sfnt_off0000f834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF834 10508 bytes
SHA-256: 63ec078f19151f1a5f79db1e1fb0c3168eb25ec692a2a98d81a2ddf18fae3fcb
font_02_sfnt_off00011baf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAF 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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