Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b08617aeb80a44…

MALICIOUS

PDF

77.3 KB Created: 2021-03-01 10:16:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: d3ee757a20712cbbe2bea5a08add916e SHA-1: e47290ad091387f86b3d7b44bad12d2f58b39305 SHA-256: 51b08617aeb80a44a4ff2bbeb7d8bccb332b1a09f4f7d026254ca3d888c60825
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting an effort to obscure the true malicious destination. The document body, though heavily obfuscated, appears to contain keywords related to search terms, reinforcing the lure of a search result.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/award?keyword=keurig+b60+replacement+parts PDF link annotation
    • https://cdn.sqhk.co/vovewotutal/gjbpngj/assistive_touch_apk_for_android_4._1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421776/normal_60357613b9dcf.pdfIn PDF document text
    • https://cdn.sqhk.co/dudexobexine/HDhjjfc/mame_arcade_game_emulator_apk.pdfIn PDF document text
    • https://nopefulewipedu.weebly.com/uploads/1/3/4/3/134314682/147f29.pdfIn PDF document text
    • http://lijonotogi.scienceontheweb.net/the_complete_book_of_questions_free.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/gic9jcK/uphill_rush_racing_game_download.pdfIn PDF document text
    • http://sixesijilolun.mywebcommunity.org/44584093960.pdfIn PDF document text
    • https://xunitaminovo.weebly.com/uploads/1/3/5/3/135349323/f3e573a64ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365560/normal_601b6597373da.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tejizikadojuni.epizy.com/disturbed_sound_of_silence_vocal_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/wobitomigenadarabi.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/android_usb_obd2_software.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_off0000f14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14D 5656 bytes
SHA-256: fbc9525781099cf8267e275bf0117af2368139f4a3deb95a7fd406798294f32e
font_01_sfnt_off0001047a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047A 10504 bytes
SHA-256: ce395a30924fd2c57b2d26d2333b87d95e6ebf979d0a8fb5eab31c319a8400b8

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