Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec17ce0132ef46da…

MALICIOUS

PDF

112.5 KB Created: 2021-01-12 14:21:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5e23294c19855569e612e09ed9a96d1e SHA-1: 285e7dfd1680e00119401b8cf9df8e8a83d2da24 SHA-256: ec17ce0132ef46da51630f824469874aa71992e2c5ba5a50d7514ee06988b345
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector URL. The ML classifier and ClamAV also flagged the file as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/aws?utm_term=centre+europ%25C3%25A9en+de+formation+avis+2018 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367275/normal_5f8f279088a47.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/gosibokuvefuj.pdfIn PDF document text
    • https://jimivisimobud.weebly.com/uploads/1/3/4/9/134901817/tixezapud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368772/normal_5f93ed6ba4669.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450430/normal_5fd977dbc66bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421213/normal_5fa4f98b81921.pdfIn PDF document text
    • https://lezotaxodad.weebly.com/uploads/1/3/4/4/134432483/sewupozemefub_budafimetokoga_matepakamibodum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445101/normal_5fb8e8f3af543.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367296/normal_5f88ae63efae0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382406/normal_5fa3dcc8172a9.pdfIn PDF document text
    • https://site-1196011.mozfiles.com/files/1196011/field_hockey_defense_tips_videos.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/nijosinizo/59251606405.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/singular_and_plural_pronouns_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/29360872358.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CC2 5784 bytes
SHA-256: 869028ddcf6d747a8f66f10918e8b3b688afa7759a77a2a35c0ceced823944c6
font_01_sfnt_off00017019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17019 3720 bytes
SHA-256: 40ef96da86b6123d577d475be460de15c41b9ca7393a8e650be4e9942aa3c64b
font_02_sfnt_off00017b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B7B 13040 bytes
SHA-256: 165856254883c9d3c0797c40476579c5a2115072add0f3cda8a6d5830750ea65
font_03_sfnt_off0001a412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A412 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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