Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a1b7c1bc943b765…

MALICIOUS

PDF

72.4 KB Created: 2020-11-19 20:44:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ff2c857f127898e7f1654955b5ea53db SHA-1: eb8cc76e1960f79ec3852f2cf9f45af8acb6e00b SHA-256: 3a1b7c1bc943b765743929883acf3f1eb18840092fffe768e2e321825f1dc636
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to Weebly and other hosting services, suggesting a link farm or SEO spam tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristics indicate an attempt to redirect users to potentially malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=metal+lathe+projects PDF link annotation
    • https://detosujedeke.weebly.com/uploads/1/3/4/3/134371576/959474.pdfIn PDF document text
    • https://xedatuvigino.weebly.com/uploads/1/3/4/5/134580066/roratemasegidalizos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426271/normal_5faf8d4e0cecd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388814/normal_5f9c885f79c65.pdfIn PDF document text
    • https://wudumimimi.weebly.com/uploads/1/3/4/3/134356267/redubawug-supafelid-kuseg.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/lijulijowivaze/10842606711.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcbed2ed-860f-413e-a872-f32e70781205/the_myth_of_the_young_start-up_whizz.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/valve_regurgitation_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7acda13e-8fc8-49a6-8cd5-a54bc2619079/rafabesametasuvuribu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3893890-26fe-42cf-ab70-b8bed49d298e/52184805415.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83306f25-9835-45e0-be63-42acb9488f3b/sse_step_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c6f1589-eb23-4b39-8141-690dacedac0f/mansion_robe_and_crown_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/fexeniwafabixet.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_off0000d344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD344 4736 bytes
SHA-256: 134030f703e20ee4246b406876e879c59a6b0e05daa488a712d756f7b67f7636
font_01_sfnt_off0000e37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37C 10380 bytes
SHA-256: 61245eebb53b6962c37d5dadbd56ee9048c2de783e533595361c714713a5a16c
font_02_sfnt_off00010717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10717 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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