Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fbdadccad182f00…

MALICIOUS

PDF

92.6 KB Created: 2021-02-17 23:45:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 96cecd6bff8f06f24d74e9049e158428 SHA-1: f0f4531c17ae8a4ff7ea53977110d94a5d118626 SHA-256: 8fbdadccad182f00f2ce51b8297a15ab9dd3fc54f4425c38ef751a2f1697ebe2
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a scheme to host many links on disposable domains, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jottigo.ru/aws?utm_term=twilight+fanfic+master+of+the+universe+chapter+1 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4479226/normal_60082a8032901.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369183/normal_602c6c55a251c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402481/normal_602b7ac513025.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373782/normal_5fd5f4610e1fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480580/normal_5fe4ec9309417.pdfIn PDF document text
    • https://petuxomurekag.weebly.com/uploads/1/3/0/8/130874153/fb626d733593.pdfIn PDF document text
    • https://mumizajasaliso.weebly.com/uploads/1/3/4/5/134598274/lixegu_badanudukoliki_punigodukij.pdfIn PDF document text
    • https://pafetujesotizi.weebly.com/uploads/1/3/5/3/135348857/sarojuxapasabivim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472198/normal_600eaa4528296.pdfIn PDF document text
    • https://xojuliwujugiseb.weebly.com/uploads/1/3/4/3/134388488/tikabeka_wokagemumopo_pejamuw.pdfIn PDF document text
    • https://fobuxowomi.weebly.com/uploads/1/3/4/2/134235628/wutovorapedes_marunozonijin.pdfIn PDF document text
    • http://potolkilife.ru/alegreya_font_for_wordmkm08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422144/normal_602446fbc2a49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474736/normal_601624c1055de.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/32340538464.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/greenman_investments_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/blank_calendar_template_june_july_2019.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4A 5580 bytes
SHA-256: 9ffb14c52df2804d29a6291d15bcf95948b096c4e9bb471f54f4137ddefeadc9
font_01_sfnt_off00014041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14041 10964 bytes
SHA-256: c8457acdf47fc93a541108e412856073b4e78693f96056a9dbc1a1b6098859b5

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