Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba5f786255691738…

MALICIOUS

PDF

74.4 KB Created: 2021-01-17 14:05:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c9cc7d08af2c9f53469f4a7d64e0cda9 SHA-1: b2c45490dc7b2be889801fec6eaa151217427c16 SHA-256: ba5f7862556917389abe102d4f3c8ef5906bd8d6cfdccdb648e25cc7f3da527d
224 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, specifically advertising a free version of Acrobat Reader. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly indicate malicious intent. The document's purpose appears to be a lure for users to download a payload, potentially disguised as software, from the linked redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://gettraff.ru/aws?utm_term=acrobat+reader+professional+free++full+version In PDF document text
    • https://site-1174515.mozfiles.com/files/1174515/govupuz.pdfIn PDF document text
    • https://jobugatiponez.weebly.com/uploads/1/3/4/2/134234820/9021202.pdfIn PDF document text
    • http://sunipemumax.66ghz.com/degixarenipazunaduzas.pdfIn PDF document text
    • https://gavixidosoxadi.weebly.com/uploads/1/3/0/7/130776067/xuvunatudegezekoge.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/tifig6a/98852398022.pdfIn PDF document text
    • https://site-1166618.mozfiles.com/files/1166618/android_10_for_moto_one_power.pdfIn PDF document text
    • https://nilesezijifata.weebly.com/uploads/1/3/4/8/134885493/3d8ae3d85c3d.pdfIn PDF document text
    • http://megesodore.iblogger.org/music_certificate_template_printable_free.pdfIn PDF document text
    • http://sojuvofud.22web.org/vimoludenofitet.pdfIn PDF document text
    • https://site-1243298.mozfiles.com/files/1243298/liwofujoloda.pdfIn PDF document text
    • https://site-1176941.mozfiles.com/files/1176941/82245619847.pdfIn PDF document text
    • https://jibowosiz.weebly.com/uploads/1/3/4/6/134632869/8f8330.pdfIn PDF document text
    • http://potusowo.22web.org/audio_recorder_and_editor_pro_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fufagarafe.epizy.com/motorola_one_android_one_case.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/curriculum_vitae.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE572 5340 bytes
SHA-256: c884094ed03c9e7d3ece348eda7a835a1ff6456db21be57400f6252b52a342a6
font_01_sfnt_off0000f7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AD 10700 bytes
SHA-256: 0c93d411372ef60bdf798a6667ff52baa9fe49acf5064cfb91470e073dcc58fc

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