Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3f960f839f290ad…

MALICIOUS

PDF

72.5 KB Created: 2021-03-04 00:58:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: cb3b0cf26720fe59b089bfe1a79140d8 SHA-1: a526821c5159207da4dbd7f3adb73a6f0e8276a1 SHA-256: d3f960f839f290ad6f2f45591a267b17ac6f769345df42b2dfa61911b3be3d37
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the 'link farm' heuristic strongly indicate an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wix?keyword=rust+base+design PDF link annotation
    • http://likefetevu.getenjoyment.net/why_is_sound_bad_on_zoom.pdfIn PDF document text
    • http://soxisit.22web.org/16558996373.pdfIn PDF document text
    • http://xazerakovewule.22web.org/how_to_reset_lg_washing_machine_pe_error.pdfIn PDF document text
    • http://rubeatyshop.xyz/gotec_leak_detection_spray_safety_data_sheethh474.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454984/normal_5fd83f154a0f0.pdfIn PDF document text
    • https://fetezubusob.weebly.com/uploads/1/3/2/6/132681625/kipebesidakebot-bupotudakox-rozokesifik-sowapitunod.pdfIn PDF document text
    • https://cdn.sqhk.co/bidekidarub/byQjbzO/stoney_s_uptown_trivia.pdfIn PDF document text
    • http://waystep.site/atlas_map_book_in_telugu8urzr.pdfIn PDF document text
    • http://vulufinagi.mypressonline.com/75921860988.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459054/normal_60077d0940c78.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476127/normal_5fd04d948db58.pdfIn PDF document text
    • http://sijemogezabusa.sportsontheweb.net/the_giver_chapter_10_11_quizlet.pdfIn PDF document text
    • http://omynutural.space/970137759109b62t.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417140/normal_5fed9d7185abf.pdfIn PDF document text
    • https://cdn.sqhk.co/fonixoligem/ibhbIOU/cut_the_cake_drill_rowing.pdfIn PDF document text
    • http://gamowenugeg.sportsontheweb.net/46395832462.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kidereludabiron.epizy.com/91252087868.pdfIn PDF document text
    • http://fixetofona.epizy.com/manual_citroen_c3_tendance_2014.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_off0000e16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16C 5012 bytes
SHA-256: 782d5860456cae47951045f80d4d95b99a4c0aee8ceedb61f6a0404a2ef16006
font_01_sfnt_off0000f28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28E 10184 bytes
SHA-256: 0574c620ed04770d6e6cb56c5dc99398ca9c60f3eed93fbdf011ee567d7c11cb

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