Malicious PDF — malware analysis report

Static analysis result for SHA-256 87fc029579f7e67f…

MALICIOUS

PDF

122.9 KB Created: 2021-03-15 09:13:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e8cbc879006c3cb56a963b234f9758c SHA-1: b9daf250d8e2b26b21477618f0df07acc28a07d7 SHA-256: 87fc029579f7e67f75d1c9e165b6d847d9654b14f824246dadf4d273c4b20d9b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/wix?keyword=super+arcade+apk+uptodown
    • http://mikrotikwizard.com/filet_mignon_cooking_guideo5rnt.pdf
    • https://static.s123-cdn-static.com/uploads/4465537/normal_6005386b38daa.pdf
    • http://vigastlens.xyz/the_one_minute_manager_review0sz7e.pdf
    • https://cdn-cms.f-static.net/uploads/4382643/normal_6027eeefb6201.pdf
    • http://shoes-storie.club/14323434178sf1wv.pdf
    • http://legko.travel/473173356225r88j.pdf
    • http://firobazotu.sportsontheweb.net/daily_thanthi_news_paper_download.pdf
    • https://koximewi.weebly.com/uploads/1/3/0/7/130775363/3294793.pdf
    • http://betijeduw.getenjoyment.net/fukixaxu.pdf
    • https://cdn-cms.f-static.net/uploads/4449014/normal_600a4ca8b9211.pdf
    • https://fimosezit.weebly.com/uploads/1/3/0/7/130775491/mimiragaki_tukib_nanunuz_rajenaromepup.pdf
    • https://jiwujidevidu.weebly.com/uploads/1/3/0/8/130874067/7234143.pdf
    • http://fruit-ital.space/8558953594288cqf.pdf
    • http://www.opentle.org
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/4bc361fb-3e8f-40b5-9a03-7c2f1a3d5212/dr_jekyll_and_mr_hyde_movie_2017_dvd.pdf
    • https://uploads.strikinglycdn.com/files/e495db09-06ec-4980-a9c7-8d904dd8681c/81030693589.pdf
    • https://s3.amazonaws.com/padanivozeb/how_to_install_a_canon_mp250_printer_without_the_disk.pdf
    • https://s3.amazonaws.com/jazofi/28417899177.pdf
    • https://s3.amazonaws.com/dinilederu/cartoon_network_game_free.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://www.gnu.org/licenses/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000179ea.bin
2b0d14e9b17770e3f32e8502760d4060e2873f8213130fd02c5d8bbabdfcf1ed		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x179EA 9340 bytes
font_00_sfnt_off0000f158.bin
10cb46a9010bcc20278aee1cf230ddaed1b8ba642f3244963dcdacc2803b81bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF158 39820 bytes
font_01_sfnt_off00016909.bin
1b3778cd624748d7786c51f04b22ddd7417e399b67d9fd88da3bf273f7b29714		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16909 4948 bytes
font_03_sfnt_off0001941b.bin
44e151955bf62801c68165e8a33fd6326743c43039a5201c958d20d7ee97a8b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1941B 11420 bytes
font_04_sfnt_off0001ba62.bin
ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA62 16092 bytes
font_05_sfnt_off0001cf2a.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF2A 4324 bytes

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