Malicious PDF — malware analysis report

Static analysis result for SHA-256 4075ad3f6a3d9478…

MALICIOUS

PDF

75.3 KB Created: 2021-02-28 07:43:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 903b6ccfb98b699ab0c59b30384c2687 SHA-1: 97652ec03a98550c0c3a437b133121689eb3cb76 SHA-256: 4075ad3f6a3d94780354053bac79ec37e5d2d5dcaf3665d62f6b2e59920cfe4f
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the presence of numerous URLs suggest the document functions as a link farm, likely directing users to phishing sites or for malware distribution. The document body, though heavily obfuscated, contains text related to 'wkhtmltopdf' and a date, consistent with PDF generation tools, and the primary URL contains a 'utm_term' parameter, often used in tracking phishing campaigns.

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
  • 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://fokemale.ru/strik?utm_term=why+afraid+of+death PDF link annotation
    • https://cdn.sqhk.co/bomagomax/bbgdghI/oh_baby_song_lyrics_in_telugu.pdfIn PDF document text
    • http://1green.space/sepevudesokugumexow00sfg.pdfIn PDF document text
    • https://cdn.sqhk.co/dutedape/cjjalPA/fugosip.pdfIn PDF document text
    • https://cdn.sqhk.co/ruduligived/qhh9jhB/delal.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/pQUqjgI/24309375575.pdfIn PDF document text
    • https://cdn.sqhk.co/vigesiji/OMgcgfH/hopper_stranger_things_button_up_shirt.pdfIn PDF document text
    • http://love-your-lips.online/55483061802isl4z.pdfIn PDF document text
    • http://ubzvp.com/vanelilulazevaxezozulwr3q4.pdfIn PDF document text
    • http://flash-sar.online/696128466319tudn.pdfIn PDF document text
    • http://kifikawi.66ghz.com/mp4_audio_songs_free_tamil.pdfIn PDF document text
    • https://cdn.sqhk.co/gikokimofegi/LOhhihL/dragon_ball_super_card_collection.pdfIn PDF document text
    • http://vibolofisef.mywebcommunity.org/the_idiots_are_taking_over_bass.pdfIn PDF document text
    • https://cdn.sqhk.co/xavonepez/0AidgeO/setulaj.pdfIn PDF document text
    • https://cdn.sqhk.co/rawerusiwala/SJihjbs/tugij.pdfIn PDF document text
    • https://cdn.sqhk.co/minofavazu/33SMhbH/sos_life_alert_panic_button.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nupejodolet.epizy.com/alsager_high_school_ofsted_report.pdfIn PDF document text
    • http://dudulexo.epizy.com/never_back_down_2008_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/everything_means_nothing_to_me_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/98257001186.pdfIn PDF document text
    • http://vakutasuv.epizy.com/76681097786.pdfIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/job_interview_strengths_best_answers.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_off0000eb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB17 4900 bytes
SHA-256: 45e81c6059a74fca99757bb00632e59833a4a7958c5846cefa1898129ee29fe7
font_01_sfnt_off0000fbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD3 10720 bytes
SHA-256: b457fac09dd41b5ce0cf06de20d73795aaf96f355f428ff78857c5a934d7796e

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