Malicious PDF — malware analysis report

Static analysis result for SHA-256 feabaa31e26ed439…

MALICIOUS

PDF

83.9 KB Created: 2021-03-21 06:24:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40214fa04fb3aa50606e80ae3e6ab569 SHA-1: e2719c68dcef6a0239807df545d51df4037169f5 SHA-256: feabaa31e26ed439b83df46c4390d8e3904abbd0ce99c85b0a841a3dd06d85f0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to potentially malicious domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, contains keywords related to downloads and academic projects, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://bologen.ru/award?keyword=automobile+engineering+projects+pdf+download
    • http://boomerangoo.site/physics_dictionary_java_app4i0jp.pdf
    • http://swiss-gear-top.xyz/51937465130yl2qz.pdf
    • http://detonic-ro.website/2093394171959zqt.pdf
    • https://cdn-cms.f-static.net/uploads/4367919/normal_5fdc084e23fcc.pdf
    • http://domavera.ru/dekudono8mfcp.pdf
    • https://gabubogoko.weebly.com/uploads/1/3/3/9/133997439/6271664.pdf
    • https://lakadepoti.weebly.com/uploads/1/3/5/3/135301691/70dc36ad44652b.pdf
    • https://static.s123-cdn-static.com/uploads/4479214/normal_5fde4c194e2da.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/97c5755c-5794-4ee1-b6b7-39898e8c6d91/core_java_for_the_impatient_exercise_solutions.pdf
    • https://d45380bd-a93d-4ef2-b2bd-4c7806d1f6db.filesusr.com/ugd/5d2cf3_83e392e8ba924861a133b9d4f9b6a505.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6ca00b53-667d-4095-8210-e0898bebd4fe/what_skills_do_u_need_to_be_a_graphic_designer.pdf
    • https://uploads.strikinglycdn.com/files/baf70c36-4cbc-4158-85e7-3c9863013a9b/end_of_the_world_song_2012_movie.pdf
    • https://944bcc21-9f45-42c2-9889-8cf837fa5d1c.filesusr.com/ugd/50f869_3fea7f84b91741f4b92d675455d4155e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ea4ced6d-0af8-4e25-ae37-e98020a19edd/xuwij.pdf
    • https://uploads.strikinglycdn.com/files/772f171e-3cea-4a22-8e4a-028f37080aef/1792288255.pdf
    • https://uploads.strikinglycdn.com/files/5bcd13eb-bdca-4931-a00e-43ec2e0478f1/can_i_stream_video_from_my_ipad_to_roku.pdf
    • https://uploads.strikinglycdn.com/files/67d28aa3-5456-4f20-a978-61ceffdd328d/how_to_write_an_advertisement_analysis.pdf
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_95cf0a7f7c58432690513eec5a099577.pdf?index=true
    • https://b5c4f4dd-ae1f-4f6a-908c-f463551224e4.filesusr.com/ugd/dafd60_171f229170104d74815da0a7a2d4b4d5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a8162444-85f6-4cc5-bbf9-7d8b23e06d42/cravity_jumper_lyrics_translation.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_off000109d3.bin
f6953faa94641e8f2fa27619b7b6f2120bb6c497b7d258e836190a2cd9a666a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109D3 5772 bytes
font_01_sfnt_off00011d78.bin
82b367de81240c01631939ee1ad49db2cf35d8eb7ff798a115ef13f0b73ceeb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D78 10892 bytes

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