Malicious PDF — malware analysis report

Static analysis result for SHA-256 a93c12051ee3120e…

MALICIOUS

PDF

75.6 KB Created: 2020-12-16 18:12:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 57fb2dd9f6c045641614df6b8bc87232 SHA-1: 0ac93937402db6a0bcd3caecd210390ecbb60571 SHA-256: a93c12051ee3120e083f71b10d24852da841ebc8bc862822b8eb02bab3c0a697
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains an embedded URL pointing to 'traffnew.ru', which is likely used to redirect the user to a malicious site. The PDF's structure and content, though heavily obfuscated, suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffnew.ru/strik?utm_term=chikhaoui+fifa+13 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484818/normal_5fa9592420e86.pdfIn PDF document text
    • https://guserokofetaw.weebly.com/uploads/1/3/4/3/134341966/8bbfaa38bc81ca3.pdfIn PDF document text
    • https://pobafegesodagiz.weebly.com/uploads/1/3/4/3/134305133/zibop-lugurema-zefadolava.pdfIn PDF document text
    • https://gasutasisewejiv.weebly.com/uploads/1/3/4/4/134403787/4b33647166.pdfIn PDF document text
    • https://zejabunu.weebly.com/uploads/1/3/4/7/134719965/suzed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a91f4d6a-93a8-4788-89d4-b50d0b700844/tafupogiwa.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0696cdf132613bbbb46ad/t/5fc432adf8cdb769c668817c/1606693550135/condensed_electron_configuration_of_arsenic.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc55249c6d96458363f68a7/t/5fd041eeb8bf0379e6050b44/1607483887016/download_free_checkers_game_for_pc_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a8165f6-3cea-4729-be48-d0b80881e977/bernina_activa_130_sewing_machine.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcfd2429c5e26690260189/1606221092295/xagexixelarom.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2ebbeff13940aa24cd01f/t/5fceafeab4902412734a2d9a/1607380972316/pottery_wheel_for_sale_mn.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/deleon_springs_boat_tour.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d7dc3dfdd95b60d4c91c/t/5fc132a2a97599144e22c48e/1606496930470/kepojis.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_off0000d4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BF 4732 bytes
SHA-256: 7787f47e064a4e01a9b5dd8ef66cf6b9f087065fbcdbf58a2ee44beddd7a8cc8
font_01_sfnt_off0000e4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E7 11740 bytes
SHA-256: 0c3cc67af3ee773fd24ba205f26498634be31dbe0ef3142af0c45c527f413492
font_02_sfnt_off00010b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3D 16456 bytes
SHA-256: 75837f96ae893ea7829048cdf8c6d2ab73a081e4c88b91df0e22ee42335f0f6d

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