Malicious PDF — malware analysis report

Static analysis result for SHA-256 e57ae06e0fabfd4f…

MALICIOUS

PDF

77.2 KB Created: 2021-03-20 13:47:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c4c63178f00cbb3de967ff246d67fb8c SHA-1: a917a84f83af1e46fff6385047410db93414841f SHA-256: e57ae06e0fabfd4f4f0828ca0324ce6f780b903cc2a27469a22a92da90fe3dd9
186 Risk Score

Malware Insights

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

The PDF contains a link farm designed to direct users to external URLs, including a suspicious domain associated with malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's part of a campaign to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://midufefew.ru/strik?utm_term=badger+500+garbage+disposal+instruction+manual PDF link annotation
    • https://cdn.sqhk.co/dufimogemeka/MgChaRc/vosulibaxomunufoxi.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvitatutuv/0sihCJZ/renudonimaxan.pdfIn PDF document text
    • https://cdn.sqhk.co/lukavago/ifmQgiX/color_shift_wrap_avery.pdfIn PDF document text
    • http://lofuzuwe.22web.org/espresso_english_courses.pdfIn PDF document text
    • https://cdn.sqhk.co/luvunugoz/1drifjd/preschool_teacher_assistant_jobs_nyc.pdfIn PDF document text
    • https://cdn.sqhk.co/vugomupuzisa/jb5janx/old_bollywood_songs_ringtones_zedge.pdfIn PDF document text
    • https://dezipozapuxel.weebly.com/uploads/1/3/4/5/134595234/1282977.pdfIn PDF document text
    • https://zemizipip.weebly.com/uploads/1/3/4/0/134098502/27a31761d.pdfIn PDF document text
    • http://kexejadupuna.66ghz.com/video_song_mp4_app.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d7179dab-c972-4501-9f4a-16044ca71e84.filesusr.com/ugd/434f74_3997b7843446409eb79acb478aecf01d.pdf?index=trueIn PDF document text
    • http://pemupenox.rf.gd/23177360439.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/como_hacer_manualidades_faciles_para_halloween.pdfIn PDF document text
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_c22b3ae6147847ffbe792ee5f6726616.pdf?index=trueIn PDF document text
    • https://932aa67c-856a-4fda-9fc8-fe3f50d4acc2.filesusr.com/ugd/a25eee_0979d03ebfef472890c0833b1b662b68.pdf?index=trueIn PDF document text
    • https://054d5c26-596f-48a3-87a7-0fc79031e5db.filesusr.com/ugd/599026_8fbabbe376b24c0cb535c1b963d3af52.pdf?index=trueIn PDF document text
    • https://436010f1-0dd7-4950-aec0-3bdf337573e8.filesusr.com/ugd/5a4c69_0863e12d74a74b498d286e3acb46f0d9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pilazi/48325486384.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/keerthichakra_songs_kuttyweb.pdfIn PDF document text
    • http://jefebewo.epizy.com/harry_potter_books_free_on_audible.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/toyota_corolla_stereo_wiring_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/47394515370.pdfIn PDF document text
    • https://591e60e9-54e8-4b06-a9a7-f2e0522969d0.filesusr.com/ugd/1fd4b7_f1b69ceeefb54ba3b97ed7049312b844.pdf?index=trueIn PDF document text
    • http://gemiwojo.epizy.com/10_day_green_smoothie_cleanse_book_online.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_off0000ee39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE39 5848 bytes
SHA-256: ab7bf964fa52e124dd483001fabd3a6bc603da451a0a3186f4d5fc3b08ed34ae
font_01_sfnt_off00010207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10207 10276 bytes
SHA-256: c6a63a1c9c35d7185d4214e2562d21600b35e15cb8cbeeb93b4b10d07e560f37