Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6a4dc18b0c978c6…

MALICIOUS

PDF

79.3 KB Created: 2021-04-18 20:16:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 044637b3ab51c69e5d50929445fd7c96 SHA-1: 45fc2bebd744b7495c31fc0e5f908c58c635dd92 SHA-256: a6a4dc18b0c978c642d5c726558ab0500a5c74e6dbe5c351a3d9115ab9569774
134 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious. The presence of a 'download button' heuristic suggests a lure to trick users into clicking a link, likely for phishing or malware distribution. The document body is heavily obfuscated, but the overall structure and heuristic firings indicate a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=kitchenaid+mixer+repair+grease PDF link annotation
    • http://myluckywin.site/game_of_thrones_book_series_in_chronological_orderp8atw.pdfIn PDF document text
    • https://wexipemeb.weebly.com/uploads/1/3/4/8/134860193/3095092.pdfIn PDF document text
    • http://1ux.site/attahasa_kannada_full_hd_movieeq51a.pdfIn PDF document text
    • https://cdn.sqhk.co/guzowozuk/X8Pieje/36904704199.pdfIn PDF document text
    • https://cdn.sqhk.co/letopoto/gijiLif/99564685447.pdfIn PDF document text
    • https://rexawalifutox.weebly.com/uploads/1/3/4/4/134458468/muvokukarenobowi.pdfIn PDF document text
    • http://lalashoppen.online/harga_casio_edifice_wr_20_barpca56.pdfIn PDF document text
    • http://siondez.ru/800442947170j7t9.pdfIn PDF document text
    • https://cdn.sqhk.co/piwizogir/jeUhcqw/kenyatta_university_admission_letter.pdfIn PDF document text
    • http://tumibejum.iblogger.org/french_adjectives_list_masculine_and_feminine.pdfIn PDF document text
    • https://zitifulopesere.weebly.com/uploads/1/3/4/7/134722705/tuwujad.pdfIn PDF document text
    • https://cdn.sqhk.co/ragojagef/5geDij6/7231884542.pdfIn PDF document text
    • https://cdn.sqhk.co/gojapawareke/Srjjhic/53240815027.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/gotenukevepunin/43670103824.pdfIn PDF document text
    • http://majuxitur.epizy.com/43655081983.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/vukatif.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/first_day_of_school_outfit_quiz_buzzfeed.pdfIn PDF document text
    • http://lexupatomenoj.epizy.com/68676574456.pdfIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/tuzenogutebibuziwubugunub.pdfIn PDF document text
    • http://vugoban.epizy.com/a_history_of_western_music_burkholder_9th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/22968376860.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/lavekujovixebazibezaj.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_off0000f57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57F 5492 bytes
SHA-256: 0ade008c1878bbdaf9b40ffdbf9b44ed0fb4b7d656afd97ab5f1b96eb8e4ed0a
font_01_sfnt_off0001080c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080C 11792 bytes
SHA-256: 6569a875b2d6ab49bf16a0c7edfd9b65f4714c5bf1c2c848e01a1ef78d8c8a35

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