Malicious PDF — malware analysis report

Static analysis result for SHA-256 1077dd81520f6072…

MALICIOUS

PDF

77.9 KB Created: 2021-09-18 19:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a46f0df5393213f16a07ee734855dc95 SHA-1: 7651e01f1806fbca97730e26e5944174ee1a9eb2 SHA-256: 1077dd81520f6072c3be44d0baf6824d98146dc9218890c599e15dd10da64e97
74 Risk Score

Malware Insights

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

The sample is a PDF containing numerous embedded URIs, many of which point to disposable hosting and are likely used for phishing or malware distribution. The ML classifier strongly indicated maliciousness, and the presence of embedded JavaScript further supports a malicious intent, possibly to exploit vulnerabilities or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crewmak.ru/uplcv?utm_term=midasbuy+apk+free+download PDF link annotation
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16135597839be1---56734151003.pdfIn PDF document text
    • http://opsir.eu/files/file/duruloxemabefirewenele.pdfIn PDF document text
    • http://bubb.cn/up_file/file/binuwugirigonunipevatogod.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/ketutoruduraravomelix.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/83764543111.pdfIn PDF document text
    • https://izometal.net/mm/file/64098187093.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/16498888108.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/fevuvadetefigotojokefomav.pdfIn PDF document text
    • http://hkalc.com/userfiles/fabudipefepusalozevegas.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/30608490393.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/xuwozasixepu.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/72605180159.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/44546641527.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/novevemivinuxaxeruput.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/305a12007809cfc0f3d9b1a623a63cfa/jaxijapasusagijefigise.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/zusosiw.pdfIn PDF document text
    • https://pmms-online.com/assets/file/48915415338.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/dikoxolikuworebetemab.pdfIn PDF document text
    • http://gojjang.com/uploads/files/8672968344.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/3975611537.pdfIn PDF document text
    • http://glassick.com/userfiles/file/62284786664.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/fafidij.pdfIn PDF document text
    • http://tfforming.ru/d/files/99591394404.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/90948768768.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_off0000c8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE105 10916 bytes
SHA-256: fddee3102734642069ef95129e029a8f77e5ad61b88617740258e0957d39b482
font_02_sfnt_off0000fa3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3C 18464 bytes
SHA-256: 66e5c2b92f0a63c64b882ba1a56bcbae397fe3152e404b422d66745dc320bd8c