Malicious PDF — malware analysis report

Static analysis result for SHA-256 615327adf9b0be01…

MALICIOUS

PDF

75.0 KB Created: 2021-03-15 15:51:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: d83aac9a40cdd7f88ba607c29e37b9cb SHA-1: c54d90300188a2091051a3110247102054242762 SHA-256: 615327adf9b0be01daa35ed9474fbf4f812aae20e20f418d6387b53b4ba13218
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body is heavily obfuscated and appears to be junk data, suggesting the primary purpose is to host malicious links rather than convey legitimate information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://crophysi.ru/award?keyword=characteristics+of+mathematical+language+precise+concise+powerful+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4481058/normal_5fc9f4abf1f74.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojiranat/difggTa/sniper_zombie_offline_game_apk.pdfIn PDF document text
    • http://reduslim-officialsite.site/tipos_de_personajes_del_cuentosepc1.pdfIn PDF document text
    • http://sutovuresas.mygamesonline.org/gmat_prep_online_magoosh.pdfIn PDF document text
    • https://cdn.sqhk.co/vujixete/jbGpVkQ/slow_motion_video_fx_editor_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/turanexode/jbyKnOI/verizon_smart_family_location_wrong.pdfIn PDF document text
    • http://dujojiwasemob.mywebcommunity.org/aconex_oracle.pdfIn PDF document text
    • http://nasufulorejuwe.mywebcommunity.org/acer_aspire_e15_keyboard_price_in_sri_lanka.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367308/normal_5fe107547db31.pdfIn PDF document text
    • http://swiss-gear-top.xyz/dell_poweredge_r710_server_datasheetxwpmb.pdfIn PDF document text
    • http://tuduvodakep.mypressonline.com/lexus_is_300_2jz_swap.pdfIn PDF document text
    • http://gikepofazanapol.mypressonline.com/solving_quadratic_equations_by_factoring_examples_with_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423427/normal_604b9181c42ee.pdfIn PDF document text
    • https://cdn.sqhk.co/tajugajobib/dic4Gic/23266266000.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/nelizenejakarug/leset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0abb5854-f46e-4fa7-accf-845cf63225b4/crock_pot_slow_cooker_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/how_to_test_a_oven_temp_sensor.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/catch_up_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6084f5eb-99fa-4a4a-bec5-0d4761365b9e/52696362912.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/33206337894.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_off0000e3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BC 5564 bytes
SHA-256: 4ac4f889c41cb80846bc31a24d43df89637b72f6859d7c35313d57b028a07563
font_01_sfnt_off0000f689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF689 11800 bytes
SHA-256: c005353b693061cde518792db50977c7d313ffd2e49f9c939a9b88b50f93b2b1

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