Malicious PDF — malware analysis report

Static analysis result for SHA-256 4efc519d6ecd9720…

MALICIOUS

PDF

71.1 KB Created: 2021-09-30 20:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0c46005eda18db56cd087adc1b87affd SHA-1: 005e88b32ecd4d0b883dd5d2c94f6105213c78d2 SHA-256: 4efc519d6ecd972054317e8de12bf69e9748f003eb60437cc6ecae0ba78c41a8
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded URLs, many of which point to disposable domains or redirectors, indicating a link farm designed to obscure malicious destinations. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs suggests an attempt to direct the user to potentially harmful content. No scripts were extracted, but the overall structure and heuristic firings point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 4

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=always+imposter+among+us+hack+apk PDF link annotation
    • http://texmet.pl/userimages/file/rejumefatusi.pdfIn PDF document text
    • http://yoron.net/up/files/36257372071.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311dff2176b---ripazuvawawuxi.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/kotarobokowutorelaromoda.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/banovilujoxofepibuxuzeja.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/64531949196.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/jufawogapukowifigop.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/33885524867.pdfIn PDF document text
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/291215097587.pdfIn PDF document text
    • http://imoroz.by/upload/file/jasenax.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210922043611.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/xawaxokewopelugut.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/kebunesama.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/40122072763.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/rekojoweparikuruwedupo.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/71316241886.pdfIn PDF document text
    • https://balmbeach.hometeamcorp.com/images/usr/fasikomajoxukeka.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/88940465441.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/tenazezata.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/tadiji.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/54997744247.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/88421592915.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/toneboximaletirag.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_off0000b258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB258 16636 bytes
SHA-256: f9634afe2ec03cdb86f086d43f9cfbf0d25183c69617e63d2355e33712593742
font_01_sfnt_off0000dc6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF484 11192 bytes
SHA-256: 6a8f7a56dc888b5b2d66c09b70f82219a55ee80573b7de26a3513cdf766b08a1

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