Malicious PDF — malware analysis report

Static analysis result for SHA-256 04badec7fd36c61a…

MALICIOUS

PDF

79.9 KB Created: 2021-03-17 04:39:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: b6a276df1e96a9518038a4f0912ce3df SHA-1: 525cebbc26390130788ced4ca6f8fc4789256726 SHA-256: 04badec7fd36c61a0ce5d55ed4a87b2a12400a3f8939d4ce1d397448520deaef
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many pointing to domains associated with link farms and disposable hosting, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. One critical heuristic, PDF_MALICIOUS_REDIRECTOR_LINK, flags a link to 'yafferge.ru' as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and appears to contain metadata rather than user-facing content, suggesting its primary purpose is not informational but rather to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=criminological+theory+context+and+consequences+ebook In PDF document text
    • http://texifudosino.mygamesonline.org/basic_c_programs_with_solutions.pdfIn PDF document text
    • https://wovorixikamaso.weebly.com/uploads/1/3/1/3/131378932/503a905004f.pdfIn PDF document text
    • https://mulomaninivoxom.weebly.com/uploads/1/3/1/4/131437045/xekanodonikujoset.pdfIn PDF document text
    • http://loneresel.mygamesonline.org/jomopeju.pdfIn PDF document text
    • http://vikiduxa.mywebcommunity.org/wu_tang_collection_-_kung_fu_movies_in_english.pdfIn PDF document text
    • http://minesaxofunawi.getenjoyment.net/polarity_test_of_3_phase_induction_motor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/93fe351e-ef29-4212-9091-350548f6fe58/sony_ps-lx300_turntable_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c907b62b-11e4-4352-a7b0-8d4f04449101/the_end_of_evangelion_song_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c3d16cf-80f9-456e-8bc4-d02717abc17d/psycho_book_robert_bloch.pdfIn PDF document text
    • http://mewabetowa.myartsonline.com/gebagetux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1baa4d10-371b-4da0-b025-76d2ac292de4/how_do_i_control_my_soundbar_with_my_apple_tv_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9c143b6-42bd-4a96-bc59-15e60d4b4bb2/hoover_steam_mop_cleaning_solution_alternative.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a7ec6f6-d89e-44a9-b1b6-74097382d086/how_to_stop_sea_erosion.pdfIn PDF document text
    • http://bodegifu.atwebpages.com/mary_rowlandson_a_narrative_of_the_captivity_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c33a3ad1-c408-4d54-8213-0d115968722e/molecular_cell_biology_impact_factor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f96927f3-8bbe-4597-9653-e95c2f413dff/whirlpool_ultimate_care_ii_dryer_dimensions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19959e18-bb86-4b1a-b132-ada758f292a2/selres_navy_advancement_results_2020.pdfIn PDF document text
    • http://fojosotum.myartsonline.com/12263103558.pdfIn PDF document text
    • http://rogofideb.onlinewebshop.net/what_are_the_five_potential_strategies_for_conflict_resolution_in_teams_recommended_by_maginn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8aa3b97c-c9d6-437e-9c40-f01808deaee4/dajotu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62d465ba-0ffe-4dfe-ad88-8acdd65434a8/what_does_baldwin_mean_by_the_fire_next_time.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_off0000f847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF847 5756 bytes
SHA-256: d4c176f1e8e50e4493b27d5a7f8c9af84a8d911bd1347d23063c10831f5457cd
font_01_sfnt_off00010bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB3 11196 bytes
SHA-256: 4c60bbb88ebd2585284da3932c80e6df77ccd11ec8a86846def25ef29d5135a3