Malicious PDF — malware analysis report

Static analysis result for SHA-256 95d36f9ee3b657e2…

MALICIOUS

PDF

74.8 KB Created: 2021-03-15 21:17:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 096da4030fdbac2dca37297b5361ef31 SHA-1: 4389761f679ae4036be74adaf3e2bb0bf5607c22 SHA-256: 95d36f9ee3b657e2fc7e1fddb957bf2135d6b54c3d9bd414a8ab474a1fca8cbd
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting or unknown reputation domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a search query, indicating a potential lure for users searching for specific products.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://soxebez.ru/aws?utm_term=cosco+light+%2527n+comfy+infant+car+seat+reviews PDF link annotation
    • http://tibagisuminove.sportsontheweb.net/bhartiya_samvidhan_in_marathi_free_download.pdfIn PDF document text
    • http://smirno.life/fl_studio_12_manual_free_downloadf1hji.pdfIn PDF document text
    • http://antileqphh.site/bomikoparinedawalesalbsrl.pdfIn PDF document text
    • http://kurixuj.sportsontheweb.net/45095931181.pdfIn PDF document text
    • http://lagejarejitog.mypressonline.com/47163648901.pdfIn PDF document text
    • http://pifofobexaxel.mypressonline.com/26956139904.pdfIn PDF document text
    • http://tehnikator.ru/how_to_learn_computer_networking_step_by_stepdxrm5.pdfIn PDF document text
    • http://temppicture.xyz/tunaxavajexe9e5hf.pdfIn PDF document text
    • http://rowomonug.mywebcommunity.org/16807805855.pdfIn PDF document text
    • http://supariwepexafat.mywebcommunity.org/how_is_social_learning_theory_used_in_social_work.pdfIn PDF document text
    • http://detonic-ro.website/semi_formal_attire_in_spanishwjk0j.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xukokumo.myartsonline.com/64872933555.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d9c31e1-86e7-45e4-b5a6-71efa6562a3f/25813992409.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90bec2a4-aca2-47f0-ac7a-6a264d45d0d1/best_battletech_mods.pdfIn PDF document text
    • http://zowofiz.myartsonline.com/71842187917.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/42958271135.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/bse_odisha_9th_class_english_book.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/begf_101_question_paper_2016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3427949-9c5e-444c-bfa8-fcbb2adc9e77/liwaginatigipem.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/reading_comprehension_questions_the_book_thief_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/936ad1e3-a88b-4f0c-81ff-355c79b852a6/european_stock_market_opening_time_in_india.pdfIn PDF document text
    • http://kubomefewofumim.atwebpages.com/1999_dt466_torque_specs.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_off0000e468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE468 5488 bytes
SHA-256: 778f4eb0c747078793eac643102a06c3b95e4e1611f9b103422aeea06791851e
font_01_sfnt_off0000f707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF707 11464 bytes
SHA-256: 8082b4bf9b91c81c2409dfe6b20f392faded5c0d5d3c7f55a3bbd05fffc06505

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