Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2d490457ecde5ed…

MALICIOUS

PDF

77.3 KB Created: 2020-11-25 03:41:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 33f523505002d5112a10766c6a3fbba1 SHA-1: 924e4abd85356b376e85da8a91a5dfde2aec6b8d SHA-256: c2d490457ecde5ed8c173309af6eee5e52e6c75c7fdbd0c5962fea56a43df55a
164 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a large number of external links, with one pointing to 'trafffe.ru', suggesting a link farm or phishing attempt. The presence of embedded URLs and the 'PDF_SEO_LINK_FARM' heuristic indicate the document's primary function is to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafffe.ru/123?utm_term=nick%2527s+fat+city PDF link annotation
    • https://rulafusojuxibaw.weebly.com/uploads/1/3/4/2/134265871/58d3a602.pdfIn PDF document text
    • https://dunabosugetagek.weebly.com/uploads/1/3/4/6/134601841/1660032.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393364/normal_5f99a3e1a69af.pdfIn PDF document text
    • https://nukofagola.weebly.com/uploads/1/3/4/8/134883999/robapis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383912/normal_5fa875c0eeab8.pdfIn PDF document text
    • https://sazojowob.weebly.com/uploads/1/3/4/3/134351878/3434303.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469631/normal_5fbd8851362f0.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/jirebonudur/in_what_episode_does_sesshomaru_meet_rin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9936ff47-dd26-44f9-b20e-8f76cb880ab0/60712641348.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/free_thanksgiving_coloring_sheets_for_kindergarten.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6ac42bc-36f1-4c35-a13e-5e76f41e07d7/manual_for_bissell_proheat_2x_carpet_cleaner.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/92127195893.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/tipanaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7af66c3b-d034-4817-b39a-06b9c638e824/zesemuja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb722cc6-4d3d-42bb-a514-fc1d57f54e7b/1103817132.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_off0000dcfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFB 4916 bytes
SHA-256: e2d7a14a8040ad93dcda1a47da5c089b06a34aed180e00a382e8eb5ec0b43c92
font_01_sfnt_off0000edeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEB 10308 bytes
SHA-256: 0410adaf9a3e2e8cda0fb422bad824276a5627ca853fbb3c122e61d8b1bbb7fc
font_02_sfnt_off00011153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11153 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67

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