Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8086d3d5db4a04d…

MALICIOUS

PDF

124.7 KB Created: 2021-10-07 23:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 198c90466275f00301d19578ea5070ff SHA-1: 00eca14d1d462bb310ab36586f629ffdba28a811 SHA-256: e8086d3d5db4a04d3890e6a81b9b3070dfb7bfe9158f75aa11d4cccee55533cb
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, indicating a malicious intent to redirect users. The ML classifier strongly flagged this PDF as malicious. The embedded JavaScript likely serves to obfuscate the redirection or exploit vulnerabilities, while the numerous links suggest a link farm or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 5

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=human+brain+right+lateral+view PDF link annotation
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/2571474296.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/63191880156.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/xozudipevi.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/79802221142.pdfIn PDF document text
    • http://minhanh.com/files/zipudafalizipaxalu.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/lataborobikusisijasejisi.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210902_EEE4184B0ED8B898.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/bopilumoke.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/15410186022.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/wesojafitarugimo.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/kopapejoje.pdfIn PDF document text
    • http://razzledazzleevents.in/userfiles/file/suwezegavatupexev.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/7db55cab45811239ccd83777e3f453a4/60261670272.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/bupiledifesudilazuzi.pdfIn PDF document text
    • http://fitviewer.biz/files/file/dezizobakejegazavemisebuw.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/lefonebafaxefoximizaku.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161503c2586cd7---20209751762.pdfIn PDF document text
    • https://unitjaya.com/contents/files/vabobarubi.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/jutoroxisujojof.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/95529749175.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109270128511686.pdfIn PDF document text
    • http://vuason.vn/upload/files/52908352428.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/89543435426.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/59284171526.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001977e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1977E 10648 bytes
SHA-256: a5ab0dd516e1f1ff0000af238e15cca64104e3f51a9395bbb91f57e65581fe78
font_02_sfnt_off0001af99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF99 21136 bytes
SHA-256: e87cdeb6a189c4fd56e74260cf12d73aabc97f7752e30709f12cadc4b9a948f3