Malicious PDF — malware analysis report

Static analysis result for SHA-256 663963229870a39c…

MALICIOUS

PDF

83.5 KB Created: 2021-03-10 06:34:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a11ec470a0cf1036388b0368d18cf9ff SHA-1: 17a86c5e9da465dc0cacddb7cb4ec56c54ac71a1 SHA-256: 663963229870a39cc635062722dd79b4c966a7c5b5fdc557c455946bf82a8d5e
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The presence of embedded URLs and the heuristic indicating a link farm suggest the primary purpose is to redirect users to malicious sites, likely for phishing or to download further payloads. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://soxebez.ru/123?utm_term=benefits+administrator+job+description+template
    • http://albatros-trans.ru/96294805106fqo86.pdf
    • https://gopaposoxawa.weebly.com/uploads/1/3/0/7/130740193/memijuzofanit_novegob_vojudobomozaviv.pdf
    • http://upsbox.ru/muvegegebilifiwc3uis.pdf
    • https://static.s123-cdn-static.com/uploads/4454807/normal_5ffc6bbe8691d.pdf
    • https://gudeworidive.weebly.com/uploads/1/3/4/7/134767917/webuzivewoboxubudepu.pdf
    • http://warajuvevuv.medianewsonline.com/what_is_a_loop_in_programming_java.pdf
    • http://gatofupimekow.mywebcommunity.org/gawewiluzivemulibekedajoz.pdf
    • https://cdn.sqhk.co/lagitesavap/jihbjcD/28727665189.pdf
    • http://verifiedbadges-form.com/filmywap_2018_bollywood_latest_movies_freep2hgd.pdf
    • https://cdn-cms.f-static.net/uploads/4481821/normal_5fdbd469f3c30.pdf
    • http://com-servers.online/world_war_z_2_full_movie_free_download_in_hindik3fcu.pdf
    • https://wesuzijuto.weebly.com/uploads/1/3/0/7/130740493/dd2c3f96ba2f.pdf
    • http://rijewomel.scienceontheweb.net/how_to_create_table_of_contents_in_word_2020.pdf
    • https://cdn.sqhk.co/sozodumupof/igWjhhf/photomath_calculator_pc.pdf
    • https://vitasexabu.weebly.com/uploads/1/3/0/8/130813400/2721c520c.pdf
    • http://openchambre.xyz/fox_sports_tv_guide_nrlba924.pdf
    • https://nububoreral.weebly.com/uploads/1/3/4/4/134467099/8974808.pdf
    • http://dizititakozazi.mywebcommunity.org/10396134704.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/401ab86c-2952-4dde-a49a-56d6dcc9edde/weguzirowefujewuj.pdf
    • https://uploads.strikinglycdn.com/files/d7a118a1-8e88-4498-8ea2-11dc7e91a139/we_the_animals_plot_summary.pdf
    • https://uploads.strikinglycdn.com/files/8f1a79ba-bbcd-4340-b277-9acaf44cb312/sezujaturawum.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e76f.bin
4bf207f7562db78485c656531bc4ba1ba198676f0fd4e6bbe3d5942164e68bc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE76F 5352 bytes
font_01_sfnt_off0000f97f.bin
5328abf506a3fb7a539d7fd74df3943bbd5d9b8b98083a51b1f50f9ca5b135ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF97F 10268 bytes
font_02_sfnt_off00011ce6.bin
ca5f19cdd32c88095809daa477ebc90224f49d7ea36f7d5dc5e952122fcfbd7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE6 16100 bytes
font_03_sfnt_off000131a5.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131A5 4324 bytes

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