Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa9144f462f928b2…

MALICIOUS

PDF

78.1 KB Created: 2021-02-14 05:37:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 24de5a5af454c363ab052fc39288b327 SHA-1: 6369a2a70f85a85a49a1f3073d76a14c13ec261c SHA-256: fa9144f462f928b2981800f2e496a3818ed8861fedf76838a75d53fbf9c658fb
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/wix?keyword=properties+of+alkali+metals+worksheet'. This, combined with ML classification and ClamAV detection, strongly indicates a malicious intent. The document body, though heavily obfuscated, appears to be a lure related to an 'alkali metals worksheet', suggesting a phishing or social engineering pretext to encourage link clicks.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://yafferge.ru/wix?keyword=properties+of+alkali+metals+worksheet In PDF document text
    • https://cdn.sqhk.co/pigajifaw/fHv4hAG/williams_pinball_classics_xbox_360_download.pdfIn PDF document text
    • https://cdn.sqhk.co/seworani/jcbgd9r/45406204002.pdfIn PDF document text
    • https://cdn.sqhk.co/jimumakevaji/1IhjigX/tuwuvofexenaf.pdfIn PDF document text
    • https://cdn.sqhk.co/lupobikud/hN5kgeq/gekoserorasutiw.pdfIn PDF document text
    • https://cdn.sqhk.co/bitizulokiva/yhbidhg/white_noise_lite_machine_target.pdfIn PDF document text
    • https://cdn.sqhk.co/noluxokeruma/IigJhty/raluxu.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/5ojcrid/99140059730.pdfIn PDF document text
    • https://cdn.sqhk.co/buganisazobu/2FB6Uie/38104954086.pdfIn PDF document text
    • https://cdn.sqhk.co/tamoravuwera/cnXihgf/ice_hockey_rink_meaning.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/jivala/76060741433.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/coordinate_plane_worksheets_year_8.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/senior_designer_cover_letter_template.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/84607642503.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/52563949848.pdfIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/adivasi_timli_video_song.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F7 5300 bytes
SHA-256: 13126a9875a6ae143e295fd5d0a37df12abc00e7aaf488f602abede82bc7e8c9
font_01_sfnt_off0000f2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E3 10240 bytes
SHA-256: 64d86b73a4953a0cc128568d573c1386ad34501f2a55c39584914955aa327184
font_02_sfnt_off00011644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11644 16088 bytes
SHA-256: b2ddecaff7e2361bf51021b35f9c014659943b600c4f466cb4656cea9e83b80e

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