Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a5145227c22de9b…

MALICIOUS

PDF

74.5 KB Created: 2021-01-11 08:13:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d46cbb43c079328a81f95e95778382fd SHA-1: b54a269c5c5355d836a5894c26816f5b7fef6c24 SHA-256: 3a5145227c22de9b146e4a0fab9228b4f689d690ffb18cee849aa5a59c8ba0e0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external links, many of which are hosted on disposable domains and utilize UTM parameters, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, appears to contain keywords related to popular media, likely as a lure to encourage users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffset.ru/123?utm_term=seal+team+season+1+episode+1+cast PDF link annotation
    • https://cdn.sqhk.co/jutafegobexe/fhige81/28823357059.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443602/normal_5fd611c781273.pdfIn PDF document text
    • https://site-1233793.mozfiles.com/files/1233793/catching_feelings_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/sobupepokor/gvM9hao/learning_speak_english_online_free_lessons.pdfIn PDF document text
    • https://nadazeva.weebly.com/uploads/1/3/4/4/134499610/tulama_kokapomi_xukevomigif_xikokiba.pdfIn PDF document text
    • https://cdn.sqhk.co/zofizitene/Lhfz0gf/zombie_survival_city_apk.pdfIn PDF document text
    • https://site-1177285.mozfiles.com/files/1177285/multivariable_calculus_problems_and_solutions.pdfIn PDF document text
    • https://site-1172403.mozfiles.com/files/1172403/callaway_mavrik_hybrid_headcover.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465938/normal_5ffa9f22652ee.pdfIn PDF document text
    • https://site-1178403.mozfiles.com/files/1178403/the_tattoo_flash_coloring_book.pdfIn PDF document text
    • https://site-1177701.mozfiles.com/files/1177701/unscramble_jumbled_words_16_letters.pdfIn PDF document text
    • https://jiburivaduvu.weebly.com/uploads/1/3/4/4/134473865/687919.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xipavir/68747061814.pdfIn PDF document text
    • https://s3.amazonaws.com/lososimap/canaliforme_de_heller.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/mg_university_bcom_syllabus.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/88411501586.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_off0000e718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE718 5280 bytes
SHA-256: 5e31e4f0e964f3b5404b88a9a57169ca08ce181be8065bb9d65fa4e9cc91bf47
font_01_sfnt_off0000f903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF903 10548 bytes
SHA-256: d4a71ba50d78a8f8e0c3a843b18149963f4353901a56fad0c191c64c68bfd601

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