Malicious PDF — malware analysis report

Static analysis result for SHA-256 aab6b591288f35e8…

MALICIOUS

PDF

72.5 KB Created: 2021-02-12 07:44:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 409812c1a4aa448915415513c7bb3d79 SHA-1: a03416c47d4ba0e98adcbe59500bcda82fd34b1d SHA-256: aab6b591288f35e89a44f98ab1ac767b32ec66d7e6b69b573a9ccedaf45ea91e
126 Risk Score

Malware Insights

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

The PDF contains a high number of embedded URLs, many pointing to disposable hosting or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/123?utm_term=an+introduction+to+categorical+data+analysis+dataset PDF link annotation
    • http://bujobatibu.22web.org/housing_allowance_for_pastors_form.pdfIn PDF document text
    • https://cdn.sqhk.co/monasomeb/hifFgfJ/shake_the_monkey_game_2.pdfIn PDF document text
    • https://lokulubebu.weebly.com/uploads/1/3/1/8/131856352/fexapojefiroset-rugiradanunewo.pdfIn PDF document text
    • https://favapebunekef.weebly.com/uploads/1/3/0/8/130874429/noxujedugijutabogot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387235/normal_600f359f05574.pdfIn PDF document text
    • https://cdn.sqhk.co/zudilubal/WMKUvP3/townsmen_6_mod_apk_revdl.pdfIn PDF document text
    • https://xawavefite.weebly.com/uploads/1/3/4/6/134667803/nufevedaj_givetago_jexokufas.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/xelimewat/sas_triangle_congruence_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/the_economist_28_september_2019.pdfIn PDF document text
    • http://jeruzofifisamen.rf.gd/gatopexax.pdfIn PDF document text
    • http://mobotifiriw.epizy.com/draw_io_templates.pdfIn PDF document text
    • http://lafugigolemetuk.rf.gd/gorufoge.pdfIn PDF document text
    • http://dijemawijopetu.epizy.com/suresujunudojuduvux.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF4 5080 bytes
SHA-256: 56aeea1e85c18cbabb0abb4e806600580111d664edfd104d78793fd459da2d45
font_01_sfnt_off0000e149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE149 11000 bytes
SHA-256: 86a2e5ed0fe0898786d7ee4489efded903879d873c89a555ff47e237ed401c29
font_02_sfnt_off000106b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B1 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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