Malicious PDF — malware analysis report

Static analysis result for SHA-256 e829a163529016bc…

MALICIOUS

PDF

76.2 KB Created: 2021-03-12 09:52:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 2c67def858e7cad3f9e5b79fea8d2f02 SHA-1: de613b248ebbeab48552b6af9ea6d599fa49e835 SHA-256: e829a163529016bc807f089f85b7d94cd92d8b56aec551542d2a149541d0a7b3
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm used for phishing or malware distribution. The document body is heavily obfuscated and appears to be a lure, possibly related to a manual, directing users to external URLs like 'https://ponafet.ru/strik?utm_term=hbs+800+manual+espa%25C3%25B1ol'. No scripts were extracted, but the overall structure and URL patterns are consistent with a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://ponafet.ru/strik?utm_term=hbs+800+manual+espa%25C3%25B1ol PDF link annotation
    • http://invitesistem.ru/phoenix_wright_ace_attorney_trilogy_switch_physicalicrjw.pdfIn PDF document text
    • http://dimozakebaba.scienceontheweb.net/pride_and_prejudice_movie_online_subtitrat.pdfIn PDF document text
    • http://uspehdnyaaxyz.xyz/ejercicios_resueltos_de_limites_al_infinito_con_radicaleseqi5m.pdfIn PDF document text
    • http://copyrightshelpscenters.com/conair_cord_keeper_1875_how_to_unfold_handle9jk99.pdfIn PDF document text
    • https://cdn.sqhk.co/wawerugile/fibJihd/vibalovokezogevuzikakos.pdfIn PDF document text
    • https://cdn.sqhk.co/wavudasawete/KihqCkJ/jejipovabe.pdfIn PDF document text
    • https://cdn.sqhk.co/zanudiwageg/jjCggKe/ganobomiletunajapilim.pdfIn PDF document text
    • https://cdn.sqhk.co/sulezudipozi/dHghhdw/the_dragonet_prophecy_song_sheet_music.pdfIn PDF document text
    • http://wejuveziwep.mypressonline.com/62783344468.pdfIn PDF document text
    • https://cdn.sqhk.co/vifutetax/fDbNjft/samsung_notes_not_working_after_update_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/budotedo/j6idoVj/post_office_days_off_2020.pdfIn PDF document text
    • http://belkwigs.com/31351750464uphqo.pdfIn PDF document text
    • https://cdn.sqhk.co/gesokusa/gg7hghd/3630448992.pdfIn PDF document text
    • https://cdn.sqhk.co/sigidezok/fwjbBie/sogadu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5751171-e3e7-4553-8c35-d26e575c5008/what_is_the_etiquette_for_mother_of_the_bride_dress.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81a9e0ab-e49b-4877-81c6-d29a6c217349/86117924448.pdfIn PDF document text
    • https://2a984544-7cb8-4a4d-9f60-e686f7994e39.filesusr.com/ugd/1434d3_220646c6c03049c48c9f47eb006edf6b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/26125a67-5a60-4de7-9201-54c07e0f3226/what_is_warren_buffett_investing_strategy.pdfIn PDF document text
    • https://e6e31949-ba74-43ae-8e0c-2243355e89fd.filesusr.com/ugd/69e259_f133e3b664cf4878b4dfeba24e50fb05.pdf?index=trueIn PDF document text
    • http://tososite.onlinewebshop.net/brother_printer_mfc-j5910dw_manual.pdfIn PDF document text
    • http://perexuwofogefo.onlinewebshop.net/how_do_you_apply_powder_to_denture_adhesive_beads.pdfIn PDF document text
    • https://27aa3d6a-fcc1-4574-a8e0-77dd5bf64dcc.filesusr.com/ugd/7683ec_0f5ff45d067e4a3b95f3c2348ff2188d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/69e47a58-795c-413f-9e52-49b793fbbc94/what_are_the_advantages_of_teaching_methods.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28b2253d-250c-465e-8b49-a62be2aa9e65/what_is_the_difference_between_plastic_and_elastic_deformation.pdfIn PDF document text
    • http://zitasixan.atwebpages.com/terra_mystica_chaos_magicians_stronghold.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC2 3784 bytes
SHA-256: 4ea1c0b43f0c5426d673352cd38ac87dfac697304a8f3ff87ade39c39cfcb418
font_01_sfnt_off0000da44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA44 5516 bytes
SHA-256: aaf8d39b1060bb3122a4bbba0b3bafa6e2139f95817d3479bb3a16cbb526fbdb
font_02_sfnt_off0000ec9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9B 5672 bytes
SHA-256: dbfa5413c1a9c227ff4952054b5b0b4ac96982f99bb483e8315c477d4481d2cf
font_03_sfnt_off0000faaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAA 11400 bytes
SHA-256: 846377f3f55be90e6ede9e53000172fe58ecc9308cd8beb898afab8df2e67c4d

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