Malicious PDF — malware analysis report

Static analysis result for SHA-256 8530d6d8afc8cc97…

MALICIOUS

PDF

70.0 KB Created: 2021-09-27 03:25:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 09416e355dcb0b43a2459ac97e842165 SHA-1: 2fc7d81be4de8416e823c37da25b267362a3ceb4 SHA-256: 8530d6d8afc8cc977bd6c21e6e697a2bf96073ccd154f64982fffeb4f857045d
86 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by an ML classifier as malicious and contains numerous external URIs, many of which point to disposable hosting. The heuristic 'SE_CALLBACK_LURE' indicates the document's content is designed to trick users into calling a phone number, consistent with a callback phishing or tech-support scam. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to direct users to malicious content or initiate fraudulent communication.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://smidgel.ru/uplcv?utm_term=unblocked+cool+math+games+66
    • http://sheilahancock.net/blogfck/file/lujogijakagelezutomobok.pdf
    • http://aquamedia.cn/ckfinder/userfiles/files/31811105557.pdf
    • http://egitara.com/upfiles/files/84846914268.pdf
    • https://doxity.ro/ckfinder/userfiles/files/43551601877.pdf
    • http://jadever.vn/Images_upload/files/63388455339.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161501b9db7b65---waruvevabitizenupabe.pdf
    • http://athaj2.specialty-match.com/upload/files/6704307446.pdf
    • https://megacook.pt/site/upload/file/juwobifow.pdf
    • http://benly-carson.com/product/files/nuzoladizijopuxowewuzel.pdf
    • http://konditsionery-odincovo.ru/upload_picture/file/vifuvovivokerosadu.pdf
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/88064887350.pdf
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/1951270874.pdf
    • http://namlinhchivietnam.net/userfiles/image/file/popolitixiw.pdf
    • http://jcbcharpentebois.com/ressource/site-image/files/60553655429.pdf
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/xejovepowubonugo.pdf
    • http://brukbet.com/user_images/file/92002244610.pdf
    • https://agronlogistics.com/userfiles/files/vameg.pdf
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/falepujopolurez.pdf
    • http://katela.net/userData/board/file/66202973653.pdf
    • https://digitaldaya.com/imagenes/file/41840936393.pdf
    • http://villabrown.it/userfiles/files/rerukekexeturekexuw.pdf
    • http://biblioteka-belzec.pl/upload/files/sanonogatuzuseguzar.pdf
    • https://yingzhaoliuart.com/upload/file/45925475247.pdf
    • http://centonze-vini.com/userfiles/files/60310648743.pdf
    • http://vhshf.de/File/69960005476.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2fb.bin
25d9e2206befa2327833b12a309ce9d7632ce648847dbb90186cd7592ca7526f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2FB 14992 bytes
font_01_sfnt_off0000d8de.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DE 16792 bytes
font_02_sfnt_off0000f0f5.bin
0b89b6b1347c5972a5d77e9d9604499b531496b66bcbcb7b884e9be71f522cf7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F5 11032 bytes

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