Malicious PDF — malware analysis report

Static analysis result for SHA-256 787c82972852544e…

MALICIOUS

PDF

76.0 KB Created: 2021-05-04 04:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3afb50b543edfbee7ccd6eb441f8ed62 SHA-1: b787e2fff8f84a5b45ea10187fe382893c920e57 SHA-256: 787c82972852544e24a601cfc4864675c57d49988239a810dba988b8e7f3c57f
156 Risk Score

Malware Insights

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

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 it is part of a link farm or phishing campaign designed to direct users to malicious websites. The document body, though heavily obfuscated, appears to be related to search terms, further supporting the SEO spam or phishing lure hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xezojetit.ru/strik?utm_term=como+hacer+una+ficha+de+trabajo+pdf
    • https://cdn.sqhk.co/jomenuluz/aigifie/ufc_latest_news_masvidal.pdf
    • https://cdn.sqhk.co/sufipuxifemo/P1I8ifi/inglourious_basterds_movie_720p.pdf
    • https://cdn.sqhk.co/gawagunikuw/hjgi9je/blank_japanese_writing_practice_sheets.pdf
    • https://cdn.sqhk.co/vopokemib/c8B8hhw/gajixabufitu.pdf
    • https://cdn.sqhk.co/dofexoxev/IFhj5Q5/wapisa.pdf
    • https://cdn.sqhk.co/jepivitixiwo/eqAsje2/best_shooter_games_2020_xbox.pdf
    • https://cdn.sqhk.co/vadetegubufo/HjhPlLq/foreign_affairs_magazine_jobs.pdf
    • https://cdn.sqhk.co/sovajepuxe/tibicif/sixolobedisutev.pdf
    • https://cdn.sqhk.co/merabuvi/jfJjggX/73975071577.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3da438f9-0cab-4703-a7a3-688d4ee187f9/67197382102.pdf
    • https://d38713d8-f9e0-49bf-8e72-3f46774ce551.filesusr.com/ugd/b3faf5_529fa137a2e84de783d88004e4382525.pdf?index=true
    • https://1138278f-e8d0-45ef-aef3-dbdd7428ac52.filesusr.com/ugd/5be868_b95fd577154641948a8855cb3f8b3eb5.pdf?index=true
    • https://f5f74d4f-f804-4d9b-9bfa-9964b2756261.filesusr.com/ugd/e389b3_9236fb55ffee467fbea72185676836a7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5eb27ce0-5e1a-42df-af8b-401abca2b70e/how_do_i_get_my_ged_for_free_online.pdf
    • https://e942959e-95af-4115-ab05-a6e38533eaad.filesusr.com/ugd/66f7a0_ec9c646aaba149ad89ceb8884ba31154.pdf?index=true
    • https://d525ee04-2a40-494f-8ba9-fee52f7b18ee.filesusr.com/ugd/8b8e24_c5949cda158944dba2bff891fc98efee.pdf?index=true
    • https://uploads.strikinglycdn.com/files/27b113b3-c9d9-44ff-9455-2c99c3f30def/what_is_the_theme_of_the_story_the_pedestrian.pdf
    • https://be934b08-0dcc-4e2e-8de1-c3c1c32dbfab.filesusr.com/ugd/d5415a_366f35bfce3543c298081c342aeda9aa.pdf?index=true
    • https://36071b1a-d853-4ad1-bccf-0ed894d94038.filesusr.com/ugd/906e9f_3bb9c41f13a74059835838f084ecb3b4.pdf?index=true
    • https://04a9e765-cf69-4035-9b9a-998d8fb4e692.filesusr.com/ugd/8c5016_e5347c5e92bc404f96bffc44528963c5.pdf?index=true
    • https://50bf384a-eeac-4f26-a262-e2ba1a5e00ba.filesusr.com/ugd/17159d_9917f54f23844ca28cb18f438c59f381.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9fdbcb4f-fee0-4ed6-8d76-2a808d2c6a24/luzupovibopan.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_off0000ea31.bin
fabcd9b3aa97abc010dc9c42cd41a049fbbaa3aadb90958abc50e294178d134c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA31 5304 bytes
font_01_sfnt_off0000fc0c.bin
0ae279b20fedd2e7c0bd6376ae2df5e544b26c2eeab394ab47fd06e51bf9e8b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0C 11428 bytes

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