Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ed98be93f40efc9…

MALICIOUS

PDF

77.7 KB Created: 2021-01-12 09:49:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d3f446e0b3c4ba3ca4766deb9b05194f SHA-1: 76ceae9420ff6e881ea3fb085fd0f3e74ffea506 SHA-256: 1ed98be93f40efc942722b2b3b648b2876ce088c33879a867cc7143e3edad63f
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains terms related to search queries, suggesting a lure to trick users into visiting these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 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://trafffi.ru/123?utm_term=harbor+freight+wood+lathe+accessories PDF link annotation
    • https://site-1184137.mozfiles.com/files/1184137/drum_studio_build.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389792/normal_5febf04bc7c31.pdfIn PDF document text
    • https://faturigazed.weebly.com/uploads/1/3/4/8/134859690/4892032.pdfIn PDF document text
    • https://site-1174686.mozfiles.com/files/1174686/idle_sultan_mod_apk.pdfIn PDF document text
    • https://site-1180978.mozfiles.com/files/1180978/77246155050.pdfIn PDF document text
    • https://cdn.sqhk.co/jefapukawore/hhsiirR/download_jetpack_joyride_future_mod_apk.pdfIn PDF document text
    • https://site-1178037.mozfiles.com/files/1178037/nigen.pdfIn PDF document text
    • https://site-1177793.mozfiles.com/files/1177793/toddler_bubble_pop_app.pdfIn PDF document text
    • https://site-1189736.mozfiles.com/files/1189736/mini_motor_racing_apk_data_download.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/tosego/paduxomanitotabineziw.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_off0000d9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D5 5160 bytes
SHA-256: 5bfb22b626b11768d0ebb6e9fd295af18db64f13cfa0e9a94fdc5254b3dda834
font_01_sfnt_off0000eb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7C 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off0000f40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40A 11116 bytes
SHA-256: c532ded5a69f8da219fd0b7201d9681c24b568fdbb32a5c5fcbd28b2675d88e4
font_03_sfnt_off000119b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B1 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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