Malicious PDF — malware analysis report

Static analysis result for SHA-256 49b59ac940dd01ba…

MALICIOUS

PDF

75.2 KB Created: 2021-06-06 17:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 391b51bbefb07647d044a87159dfd0b3 SHA-1: 69cb5dc351085645bd2d639758af726416d986c1 SHA-256: 49b59ac940dd01babf467c0db8c5b680e62c5b20d86d39611c29e668c0fe076a
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, suggesting a link farm, and employs a 'password-protected archive' lure to trick users into downloading further content. The primary malicious URL identified is https://maypoin.ru/123.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://maypoin.ru/123?utm_term=badmash+munda+full+hd+movie
    • https://mumojugaweweran.weebly.com/uploads/1/3/1/0/131070520/lalarudumazu.pdf
    • https://kanefudejezem.weebly.com/uploads/1/3/6/0/136056225/kakuvekijul-rodubal-pawetikagu-pixupem.pdf
    • https://popoxalisasuper.weebly.com/uploads/1/3/0/7/130775362/9f428.pdf
    • https://vomujozirokino.weebly.com/uploads/1/3/4/3/134318601/8ce645aa8.pdf
    • https://riderasal.weebly.com/uploads/1/3/0/7/130738784/ruvagu.pdf
    • https://nuniladolu.weebly.com/uploads/1/3/0/7/130775245/8395114.pdf
    • https://migawonakizize.weebly.com/uploads/1/3/1/6/131637147/dotabetisizotaforaja.pdf
    • https://gozaxuvo.weebly.com/uploads/1/3/4/6/134612917/1b7db224.pdf
    • https://bobejezesolaz.weebly.com/uploads/1/3/4/6/134622741/9141336.pdf
    • https://bonawoxe.weebly.com/uploads/1/3/3/9/133986387/migosus_kusufoxi_notusi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://niluputevi.pbworks.com/f/920931075.pdf
    • https://uploads.strikinglycdn.com/files/2f423907-b4df-4e34-a384-d61dc40f7e4f/are_soundbars_good_for_surround_sound.pdf
    • https://uploads.strikinglycdn.com/files/fdae1a89-8630-4943-95d5-c1fdbd49b756/regej.pdf
    • https://uploads.strikinglycdn.com/files/3ee893ab-afcc-461e-a3a3-bc4c76ee62ad/12852488456.pdf
    • http://gonumutat.pbworks.com/f/kuta_software_infinite_geometry_rotations_answers.pdf
    • https://uploads.strikinglycdn.com/files/b1793049-e5e9-41e4-af78-d7219a02eaac/80346763038.pdf
    • https://uploads.strikinglycdn.com/files/52e17de8-1b6d-4457-b0e3-2b0a8afe4ab8/samsung_tv_remote_aa59_manual.pdf
    • https://uploads.strikinglycdn.com/files/bd8508c9-3a4b-432e-b125-3df5f827ad93/sears_craftsman_12_band_saw_parts.pdf
    • https://uploads.strikinglycdn.com/files/d0bcdccd-f3a4-435e-aca7-3b1c36e8cea7/95920156107.pdf
    • https://uploads.strikinglycdn.com/files/c483bd8a-b109-47b4-8a20-461660d055f9/jibokajatot.pdf
    • http://siruzosu.pbworks.com/w/file/fetch/144724605/instagram_font_style_name.pdf
    • http://legesir.pbworks.com/f/33937889542.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7fb.bin
47eb22d08de3e8197ad4dee0779b27dbcf6c549090568a4bfe8962e0e3476fff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FB 5160 bytes
font_01_sfnt_off0000f972.bin
1ead5ba0274aab9a3b99c6d7df6199c833fea6b6ecee75ede480a3b9d58a28db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF972 11088 bytes

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