Malicious PDF — malware analysis report

Static analysis result for SHA-256 5242ee264d5519bf…

MALICIOUS

PDF

89.2 KB Created: 2021-04-30 22:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a6717356ad8d4c554b9bcb8ba8f828d1 SHA-1: d144b1e48ffc021f308fb8117bf4a946cec280d6 SHA-256: 5242ee264d5519bfe28b9eed101d64f6373b7e19154d3072e3399f8d5c2bb1af
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to be a lure related to a 'Minn kota riptide st 80 owners manual'. The presence of multiple links on disposable hosting and the ML classifier's high confidence score indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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/strik?utm_term=minn+kota+riptide+st+80+owners+manual In PDF document text
    • http://tejovotemikodes.getenjoyment.net/aptitude_test_shortcut_formulas.pdfIn PDF document text
    • http://fetisaletom.iblogger.org/answering_machine_sad_song.pdfIn PDF document text
    • http://mizizufiku.mywebcommunity.org/higher_engineering_mathematics_by_b._v._ramana.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/haYjjja/70480365067.pdfIn PDF document text
    • http://zitugaxusi.mygamesonline.org/billion_dollar_whale_jho_low.pdfIn PDF document text
    • http://bagadiwep.22web.org/node_js_tutorial_point_download.pdfIn PDF document text
    • http://xitimudajejo.mywebcommunity.org/anestesia_raquidea.pdfIn PDF document text
    • https://cdn.sqhk.co/luginuwi/jgvhfie/12193631692.pdfIn PDF document text
    • http://mereritijazos.scienceontheweb.net/basic_atomic_structure_worksheet_key_1.pdfIn PDF document text
    • https://cdn.sqhk.co/vefoveted/c0IoihE/stickman_fight_apk_hack.pdfIn PDF document text
    • http://sevagawos.getenjoyment.net/56587075073.pdfIn PDF document text
    • http://jabewes.medianewsonline.com/expressive_and_receptive_language_disorder.pdfIn PDF document text
    • https://cdn.sqhk.co/tijinujul/NhbJgcS/the_walking_zombie_2_zombie_shooter_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/Pijjbgi/zajanojufatekusejupetak.pdfIn PDF document text
    • http://tosefabebiribow.scienceontheweb.net/57283866836.pdfIn PDF document text
    • http://nofubajabuv.medianewsonline.com/fobawizuzokexami.pdfIn PDF document text
    • http://bimoriz.getenjoyment.net/15500998689.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://davofunup.onlinewebshop.net/articles_grammar_exercises.pdfIn PDF document text
    • http://wenares.myartsonline.com/3458593405.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/118b6003-14f0-4410-9cf4-c97ea11b8851/1582636749.pdfIn PDF document text
    • http://laxuwesesanaw.rf.gd/balivalinikosotaji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ece7dc3-48af-40da-9b53-3fb106533027/cognitive_behavioural_therapy_techniques_for_retraining_your_brain.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abfb1124-3843-41b5-a42b-f6335a0becd7/best_interview_questions_for_interviewee_to_ask.pdfIn PDF document text
    • http://tebaputazaxuva.myartsonline.com/resiliencia_en_el_ambito_laboral.pdfIn PDF document text
    • http://fixadamobus.epizy.com/lugiwifopikutudavuki.pdfIn PDF document text
    • http://kalasoziluxolim.myartsonline.com/sukimoverokunowexixuwup.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF941 5484 bytes
SHA-256: 275bb566707ffacb370e38369b11bf5a972a8be2fcdb6938a23f0827026fefd1
font_01_sfnt_off00010bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDB 11728 bytes
SHA-256: 17698966acced665ceaa0fc3591bfd604d7cc898ee677cc0a68ca1699c075e7d
font_02_sfnt_off00013402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13402 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501
font_03_sfnt_off00014930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14930 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e