Malicious PDF — malware analysis report

Static analysis result for SHA-256 65131bbccabfff74…

MALICIOUS

PDF

77.2 KB Created: 2020-12-28 20:54:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f2f8d3afc63c3ed77e7cbdc9d697b0db SHA-1: 8c7f3d063499027b68a92487889074ace9b2296a SHA-256: 65131bbccabfff747e6f5b4b5563e697eec5f913efab085629efc9439ff2ea15
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms or phishing lures, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attack pattern involving redirection to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • 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/aws?utm_term=vlookup+example+two+worksheets PDF link annotation
    • https://detopeda.weebly.com/uploads/1/3/4/3/134305225/8878880.pdfIn PDF document text
    • https://cdn.sqhk.co/wemonamo/jf21paL/musopexopowikatexagugem.pdfIn PDF document text
    • https://cdn.sqhk.co/kurinunuwor/iihi7ij/dojapixefatubikodukodibum.pdfIn PDF document text
    • https://zuvubexusemeto.weebly.com/uploads/1/3/4/3/134373725/witaximebuxosuz.pdfIn PDF document text
    • https://mefevujeloz.weebly.com/uploads/1/3/4/3/134317202/zebuvuroroxo_zijuto.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485001/normal_5fdf3d6600db9.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/rewepalazamiso/android_9_update_issues.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1079f52a-f0a6-4eab-a4e2-85074c7b1ff5/a_pocket_guide_to_writing_history_9th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1163aa38-6cb6-4cb3-bd18-aa23dcb3d5a6/75434260022.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e92920e-f0e0-4b40-a42a-6c47d25477f0/mission_impossible_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40d3d0ce-8ef2-472e-b8c7-9105e2c6c0cb/mta_retirement_age.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a03c4068-c39f-4967-81c8-8902311d0b4e/link_analysis_software_download.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96D 2932 bytes
SHA-256: 799d8a56ca134ea256fc013da43bcd6b1542585a6eee81bd268716f3963d50d5
font_01_sfnt_off0000e3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E6 4976 bytes
SHA-256: 02ddba5fa28f1f65db828c6ba348358e89341588698569d42bc822dc1c4d9eb8
font_02_sfnt_off0000f4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4ED 10736 bytes
SHA-256: 510224a561b1a95a4118dab2bd8892bc32d8f8968694cbd404b6bb90036c9456
font_03_sfnt_off000119b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B9 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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