Malicious PDF — malware analysis report

Static analysis result for SHA-256 b368cc22997eef31…

MALICIOUS

PDF

92.7 KB Created: 2021-03-05 22:41:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a309362d7d4af7287b26edbd1d444e44 SHA-1: 107335134c3a4470811128a509db74e73710fbba SHA-256: b368cc22997eef31f34072063de7d5dff458e242c120598480faccc8c31f6f74
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as Pdf.Phishing.Trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://dugedepap.ru/strik?utm_term=can+skinny+guys+gain+muscle PDF link annotation
    • http://jovopomutulilo.medianewsonline.com/dovoki.pdfIn PDF document text
    • https://cdn.sqhk.co/jawuraxexije/5zgiL3s/rufafex.pdfIn PDF document text
    • https://cdn.sqhk.co/tomubozes/h4jYhf8/teacher_appreciation_day_ideas_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/pulununese/ehigehi/draw_out_salve_for_ingrown_hair.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450351/normal_5fe843832609f.pdfIn PDF document text
    • https://cdn.sqhk.co/xekejegixawo/geSTTk4/bojikabanudo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445333/normal_6001131fa3883.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464996/normal_5fca086497aa3.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/felofapopesipowilub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365580/normal_602bf6e785604.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479715/normal_6014b23b8c6ff.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2f60c0de-bae8-48d8-8f3f-ce7907f87c52.filesusr.com/ugd/badafb_d35bd0a8054d4c9ab149d585621650a5.pdf?index=trueIn PDF document text
    • https://50fe66f1-00be-429c-ab6c-57a9f80d6ab9.filesusr.com/ugd/39cb9d_ef27aa7a13ad464384c05af98f976a6f.pdf?index=trueIn PDF document text
    • https://5984e891-aecd-43e6-866f-efdb297c9c35.filesusr.com/ugd/403565_e6e5563c985e422b8c40ad35a965f538.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac7e1884-84f4-4885-a99c-8aef3e8e6b1b/mean_median_mode_range.pdfIn PDF document text
    • https://2e907eb7-0cdb-46e5-a4de-ff0e34d1b96e.filesusr.com/ugd/7ea2c5_2def55811ed44458bd8cfcad1ba81038.pdf?index=trueIn PDF document text
    • https://2aa89031-56ac-4de1-b828-aabe99840ec8.filesusr.com/ugd/cf14a4_a96ab9643e0a4b06a0657645155729b5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a48730b-579d-4f38-9f83-6553b3537779/92352661115.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a914994-9bb9-452c-ae89-a80e72a39022/iowa_codes_and_laws.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A4 5092 bytes
SHA-256: ceb1a3a2e1494af0406784dfcf4b419333b51f5ef609208827a12490b0d15cf1
font_01_sfnt_off000128f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F9 10596 bytes
SHA-256: f9ad197de2af48048e2816479b9ae2746451e4a63935fcc445ee63b651d6c22f
font_02_sfnt_off00014d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D3F 16972 bytes
SHA-256: 9a7914a34e19f14134eaaa825fd31dc5964cddfb4cd0bbc44a5632eb7bac45eb