Malicious PDF — malware analysis report

Static analysis result for SHA-256 815663b01abd920a…

MALICIOUS

PDF

85.9 KB Created: 2021-03-20 18:48:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bbbe0a8312dee97bf2f0e8ef8e8acdd7 SHA-1: 99afa3be13020eda6d1adc5b1f6f032685b7dbff SHA-256: 815663b01abd920aaff412ede48024a5b734ce7dbc9ede40192b5afb3cdaaa31
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous external links, with the primary malicious URL being https://jacksth.ru/wix?keyword=land+and+water+animals+worksheets+for+kindergarten. The file's structure and the presence of embedded links suggest it is designed to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/wix?keyword=land+and+water+animals+worksheets+for+kindergarten
    • https://wonumajogo.weebly.com/uploads/1/3/1/3/131379434/sugopo.pdf
    • https://dopotalufiru.weebly.com/uploads/1/3/4/6/134601398/a0cd7d1e.pdf
    • https://donixefafara.weebly.com/uploads/1/3/4/3/134310569/9183736.pdf
    • http://jamotovoxut.mywebcommunity.org/oracle_sql_queries_examples_with_answers_free_download.pdf
    • http://xuzerujagojagip.scienceontheweb.net/air_conditioning_maintenance_procedures.pdf
    • https://tijuvenunulufuv.weebly.com/uploads/1/3/4/6/134625509/0c3224.pdf
    • https://puruvafapazono.weebly.com/uploads/1/3/0/8/130815059/0688c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://200c4c3d-185b-4246-b99f-f40cd7065c99.filesusr.com/ugd/3ed902_8b69525783aa408e9aa4ba3ebf9f3a3e.pdf?index=true
    • http://bigapenegig.atwebpages.com/38899679274.pdf
    • https://58552d80-c20c-4e4f-99b9-91bedbcc07a3.filesusr.com/ugd/c18496_63175f96e337411cae03b30425a0f0a0.pdf?index=true
    • https://8b7199fc-a029-4910-8138-caee300d1cbd.filesusr.com/ugd/da8f68_85cfd8d8897946c7ba6fda9cd67aa577.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9161e467-afd4-4dd0-9ae5-1f10f6883a4f/big_fish_game_manager_app_for_mac.pdf
    • https://uploads.strikinglycdn.com/files/c3c1c208-0143-4584-a9f0-25dc97c44b81/29332602532.pdf
    • https://uploads.strikinglycdn.com/files/a5b75b27-5afb-49bf-a069-43dbfbe91db4/95509852591.pdf
    • https://2e5cbe44-7de3-4e3f-b94c-8a8567814465.filesusr.com/ugd/f96b02_d9a483bc02674d16a1e7eec43f0732da.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bee94b36-47c0-4e46-ad5c-15d1774d7de9/mitiremiwibaputolofiko.pdf
    • https://uploads.strikinglycdn.com/files/60e3c92d-6f15-4e15-99cd-d6b9b118e968/rugikoboxitasibasi.pdf
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_4882b39feb0145238fadbf07f4221e98.pdf?index=true
    • https://ddd90330-5837-4e0c-b2f6-9383941cd2db.filesusr.com/ugd/568e2c_3e702b851c8d430595aab686b75b5dda.pdf?index=true
    • https://77701ba7-c5ad-4750-ab17-5b03548f7fc0.filesusr.com/ugd/9a242c_4f6ef982fd014c40b45823fb83cf555c.pdf?index=true
    • https://e5058785-d3d1-442e-b0ad-d0045053dde7.filesusr.com/ugd/17c622_d0b87e8b1a6a428791f2b63ce6aa7c98.pdf?index=true
    • 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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • 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_off0000ed59.bin
3d4760ca295192c89086870ebbac49c5a5945404ea6ab57fca452cf2db5f569a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED59 6440 bytes
font_01_sfnt_off0000fd4d.bin
dd6c079145914b4d1e498b604919f4f8609f84656b2084bb6421e222d1df2729		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4D 5416 bytes
font_02_sfnt_off00010fa8.bin
ee2a8d9cb926c7f16d709fff6b0caa440ccf82c2172d7902fd6e08260cb92a42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA8 10780 bytes
font_03_sfnt_off000134e2.bin
52db30b66cfb76898988bc7c6ed152514c301740808ab95bec9c68e49df23550		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134E2 16036 bytes

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