Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd237c04087e9406…

MALICIOUS

PDF

68.1 KB Created: 2021-03-11 08:00:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b3ed06124f17eecfa75aa1259c5a1d3d SHA-1: 31ae93fb62ad3bf25c3c45df36e1bf69066d4d10 SHA-256: bd237c04087e94069835daa588f365b1abcac8c15b2d4fa65098a28159752466
96 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document body, though heavily obfuscated, contains text related to a "bilge pump manual" and references the authoring application 'wkhtmltopdf', suggesting a lure to a malicious URL. The embedded URI points to 'baarspo.ru', likely a phishing domain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baarspo.ru/123?utm_term=rule+1000+bilge+pump+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450340/normal_60245789453f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393893/normal_600fc5841bebd.pdfIn PDF document text
    • http://xawegap.mywebcommunity.org/nukoturulesapuxawitivug.pdfIn PDF document text
    • http://lemugedapa.iblogger.org/75401006172.pdfIn PDF document text
    • http://zenajok.medianewsonline.com/3961460373.pdfIn PDF document text
    • http://lipexifinidoda.scienceontheweb.net/fuguviwamezosotaposakizaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500429/normal_602dc71820342.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fawivemepogu.epizy.com/tivox.pdfIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/how_to_operate_ge_front_load_washer.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/tafogepokenusis.pdfIn PDF document text
    • http://milulizoxozeb.rf.gd/black_skins_white_masks_summary.pdfIn PDF document text
    • http://likutolejit.onlinewebshop.net/is_nbc_on_dish.pdfIn PDF document text
    • https://s3.amazonaws.com/tosego/brand_guidelines_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/play_chess_against_computer_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/desovifa.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/free_online_video_casino_games_no.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/guwomazevovom.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/blogger_api_android_example.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/jio_cinema_app_for_android_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/abilene_reporter_news_classified.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/64049650943.pdfIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/plan_y_programa_aprendizajes_clave_primaria_cuarto_grado.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/nordictrack_cx_938_ebay.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_off0000cc1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1F 5208 bytes
SHA-256: 41cd36abb122b4b9875bf463513a35caa8958693db7167c62b01b5cd9907d71b
font_01_sfnt_off0000ddd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD0 10596 bytes
SHA-256: 66dec238ee30bc8a10331538285be4e10f820a872942e95dd405ce7832b84b5d

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